JP2021116342A - Fuel oil composition for external-combustion engine and method for producing the same - Google Patents

Abstract

To provide a fuel oil composition for an external-combustion engine, that has excellent stability even in long-term storage, exhibits excellent low-temperature fluidity even in cold regions during a cold season, exhibits excellent combustibility even in an external combustion engine equipped with a hydraulic spray burner with a low rated combustion amount and low spray oil pressure, and furthermore, can provide a stable supply with a high yield rate and contribute to improved fuel efficiency by having a high calorific value.SOLUTION: The fuel oil composition for the external combustion engine with specific properties comprises: a heavy kerosene fraction containing 90.0% by volume or more of a distillate obtained by hydro-desulfurizing a straight distillate obtained by atmospheric distillation of a crude oil; paraffin based hydrocarbons; and an antioxidant, wherein content of the paraffin-based hydrocarbon based on a total amount of the composition is more than 10% by volume to less than 40% by volume, and the content of the antioxidant based on the total amount of the composition is 20 mass ppm or more to 100 mass ppm or less, and the method for producing is the method for producing the fuel oil composition for the external combustion engine.SELECTED DRAWING: None

Description

The present invention relates to a fuel oil composition for an external combustion engine and a method for producing the same.

As fuel oil compositions for external fuels such as boilers, hot air heaters, and industrial furnaces, mainly kerosene (JIS K 2203), A heavy oil (JIS K 2205 type 1 heavy oil), and C heavy oil (JIS K 2205). 3 kinds of heavy oil) is used.

Kerosene has an extremely low content of sulfur, nitrogen, and residual carbon, and has a characteristic that the environmental load due to combustion is small. In addition, because of its excellent low-temperature fluidity, it has excellent flammability even when used in an external combustion engine equipped with a hydraulic spray burner with a low rated combustion amount and low spray oil pressure in cold regions during the severe cold season. Demonstrate. However, in cold regions in winter, there is a large demand for kerosene for indoor heating, etc., and special consideration is required for stable supply.
Heavy oil A generally has an advantage of excellent supply stability and a higher calorific value than kerosene. However, for heavy fuel oil A, it may be necessary to take measures such as equipment measures in order to prevent filter blockage due to wax precipitation in the severe cold season of cold regions. Further, when the heavy fuel oil A is used for an external combustion engine equipped with a hydraulic spray burner having a small rated combustion amount and a low spray flood pressure, it is necessary to improve the combustibility.
C heavy oil has a higher calorific value than A heavy oil. However, since it has a high viscosity, it is inconvenient to handle because a heating facility is required at the time of use. Further, since C heavy oil has low combustibility, it cannot be used for an external combustion engine equipped with a hydraulic spray burner having a low rated combustion amount and a low spray flood pressure, and has a high sulfur content, nitrogen content and residual carbon content. It has the disadvantage of having a large environmental load.

For the purpose of contributing to the stable supply of the fuel oil composition for external combustion engines in winter, the present inventors have exhibited excellent stability in long-term storage and also in cold regions in severe cold seasons. A fuel oil composition for an external combustion engine that exhibits low-temperature fluidity, exhibits excellent combustibility even in an external combustion engine equipped with a hydraulic spray burner with a small rated combustion amount and a low spray hydraulic pressure, and can be obtained with a high yield rate. (See Patent Documents 1 to 3).

Japanese Unexamined Patent Publication No. 2004-182744 Japanese Unexamined Patent Publication No. 2004-182745 JP-A-2017-114948

However, while further stabilization of the supply of fuel oil compositions for external combustion engines and improvement of fuel efficiency by improving calorific value are desired, especially in winter, only the fuel oil compositions described in the above patent documents are desired. However, there are cases where it is not possible to sufficiently cope with the situation, and there is a demand for a fuel oil composition for an external combustion engine that uses a wider variety of base materials and satisfies various required performances.

Therefore, the present invention is equipped with a hydraulic spray burner that has excellent stability even in long-term storage, exhibits excellent low-temperature fluidity even in cold regions during the severe cold season, has a low rated combustion amount, and has a low spray oil pressure. Fuel oil compositions for external combustion engines, which show excellent combustibility even in external combustion engines, can be stably supplied with a higher yield, and can contribute to improving fuel efficiency by having a high calorific value. It is an object of the present invention to provide the manufacturing method.

As a result of diligent studies in view of the above problems, the present inventor has found that the following invention can solve the problem. That is, the present invention provides a fuel oil composition for an external combustion engine having the following configuration and a method for producing the same.

[1] A heavy substance that satisfies all of the following conditions _{(a 1} ) to (e ₁ ), containing 90.0% by volume or more of a hydrodesulfurized fraction obtained by atmospheric distillation of crude oil. The kerosene fraction _{contains a paraffinic hydrocarbon and an antioxidant that satisfy all of the following conditions (a 2} ) to (e ₂ ), and the content of the paraffinic hydrocarbon based on the total amount of the composition exceeds 10% by volume. An external fuel machine in which the content is less than 40% by volume, the content of the antioxidant based on the total amount of the composition is 20% by mass or more and 100% by mass or less, and all of the following conditions (1) to (6) are satisfied. Fuel oil composition for.
(A ₁ ) Initial distillation point is 140.0 ° C or higher (b ₁ ) 95% by volume distillation temperature is 271.0 ° C or higher and 300.0 ° C or lower (c ₁ ) Flash point is 40.0 ° C or higher (d ₁ ) sulfur content of 3 ppm by mass or more 10 wt ppm or less _{(e 1)} cloud point -20.0 ° C. or less _{(a 2)} saturates content of 99.0% by volume or more _{(b 2)} sulfur content 20 mass ppm or less (c ₂ ) Cloud point is -50.0 ° C or less (d ₂ ) Dynamic viscosity at 30 ° C is 5.00 mm ² / s or more 20.0 mm ² / s or less (e ₂ ) Flash point is 70. 0 ° C or higher (1) Initial distillation point is 140.0 ° C or higher (2) 95% by volume distillation temperature is 275.0 ° C or higher and less than 310.0 ° C (3) Flash point is 40.0 ° C or higher (4) Sulfur Content content is 3% by mass or more and 10% by mass or less (5) Cloud point is -20.0 ° C or less (6) Total calorific value is 37,000 (kJ / L) or more [2] Obtained by atmospheric distillation of crude oil A heavy kerosene distillate containing 90.0% by volume or more of the hydrodesulfurized distillate, which satisfies all of the following conditions _{(a 1} ) to (e _{1 ), and the following (a 2} ). ~ a (e ₂₎ conditions of the paraffinic hydrocarbon and antioxidants which satisfies neither the paraffinic content of the total amount of the composition of the hydrocarbon is less than 10 volume percent 40 volume%, the antioxidant A method for producing a fuel oil composition for an external combustion machine, which satisfies all of the following conditions (1) to (6), and is blended so that the content based on the total amount of the composition is 20% by mass or more and 100% by mass or less. ..
(A ₁ ) The initial distillation point is 140.0 ° C. or higher (b ₁ ) 95% by volume distillation temperature is 271.0 ° C. or higher and 300.0 ° C. or lower (c ₁ ) The ignition point is 40.0 ° C. or higher (d ₁ ). Sulfur content is 3% by mass or more and 10% by mass or less (e ₁ ) Cloud point is -20.0 ° C or less (a ₂ ) Saturation content is 99.0% by volume or more (b ₂ ) Sulfur content is 20 mass ppm or less (c ₂ ) Cloud point is -50.0 ° C or less (d ₂ ) Dynamic viscosity at 30 ° C is 5.00 mm ² / s or more and 20.0 mm ² / s or less (e ₂ ) Flamm point is 70. 0 ° C or higher (1) Initial distillation point of 140.0 ° C or higher (2) 95% by volume distillation temperature of 275.0 ° C or higher and lower than 310.0 ° C (3) Flammability of 40.0 ° C or higher (4) Sulfur Content content is 3% by mass or more and 10% by mass or less (5) Clouding point is -20.0 or less (6) Total calorific value is 37,000 (kJ / L) or more

According to the present invention, it is equipped with a hydraulic spray burner that has excellent stability even in long-term storage, exhibits excellent low-temperature fluidity even in cold regions during the severe cold season, has a low rated combustion amount, and has a low spray oil pressure. Fuel oil composition for external combustion engines and its production, which show excellent combustibility even in external combustion engines, can be stably supplied with a high yield, and can contribute to the improvement of fuel efficiency by having a high calorific value. A method can be provided.

Hereinafter, a fuel oil composition for an external combustion engine according to an embodiment of the present invention (hereinafter, may be simply referred to as “the present embodiment”) and a method for producing the same will be specifically described. In addition, in this specification, the numerical values relating to "less than or equal to", "greater than or equal to" and "to" relating to the description of the numerical range are numerical values that can be arbitrarily combined, and the numerical values of Examples are used as upper limit values or lower limit values. It is a numerical value that can be obtained.

[Fuel oil composition for external combustion engine]
The fuel oil composition for an external combustion machine of the present embodiment contains 90.0% by volume or more of a fraction obtained by hydrocarbonizing and desulfurizing a direct fraction obtained by atmospheric distillation of crude oil (a ₁ ). 140.0 ° C or higher, (b ₁ ) 95% by volume distillation temperature 271.0 ° C or higher and 300.0 ° C or lower, (c ₁ ) ignition point 40.0 ° C or higher, (d ₁ ) sulfur content A heavy kerosene fraction that satisfies the conditions of 3% by mass or more and 10% by mass or less and (e ₁ ) a clouding point of -20.0 ° C. or less, and (a ₂ ) a saturated content of 99.0% by volume. As described above, (b ₂ ) sulfur content is 20% by mass or less, (c ₂ ) clouding point is -50.0 ° C or less, and (d ₂ ) kinematic viscosity at 30 ° C is 5.00 mm ² / s or more and 20.0 mm. ^It contains paraffinic hydrocarbons that satisfy the conditions of 2 / s or less and (e ₂ ) ignition point of 70.0 ° C. or higher, and antioxidants, and the content of the paraffinic hydrocarbons based on the total amount of the composition is It is more than 10% by volume and less than 40% by volume, the content of the antioxidant based on the total amount of the composition is 20% by mass or more and 100% by mass or less, and (1) the initial distillate is 140.0 ° C. or more, ( 2) 95% by volume distillate temperature is 275.0 ° C or higher and lower than 310.0 ° C, (3) ignition point is 40.0 ° C or higher, (4) sulfur content is 3% by mass or more and 10% by mass or less, ( Both the conditions of 5) the clouding point of -20.0 or less and (6) the total calorific value of 37,000 (kJ / L) or more are satisfied.

(Composition and properties of fuel oil composition for external combustion engine)
The fuel oil composition for an external combustion engine of the present embodiment satisfies all of the compositions and properties specified in (1) to (6) above. Each of the provisions (1) to (6) will be described in detail below.
(1) Initial distilling point The initial distilling point of the fuel oil composition for an external combustion engine of the present embodiment is 140.0 ° C. or higher. If the initial distillate is less than 140 ° C., the handling safety is reduced. From the viewpoint of improving handling safety, it is preferably 145.0 ° C. or higher, more preferably 155.0 ° C. or higher, and from the viewpoint of improving profitability and flammability, the upper limit is preferably 175.0 ° C. ° C. or lower, more preferably 170.0 ° C. or lower.
In this specification, the initial distillation point, the 95% by volume distillation temperature and the end point, which will be described later, are values measured according to JIS K2254: 1998 (Petroleum products-distillation test method-).

(2) 95% by Volume Distillation Temperature The 95% by volume distillate temperature of the fuel oil composition for an external combustion engine of the present embodiment is 275.0 ° C. or higher and lower than 310.0 ° C. If the 95% by volume distillation temperature is not within the above range, an excellent yield cannot be obtained. When the 95% by volume distillation temperature of the fuel oil composition for an external combustion engine is 275.0 ° C. or higher, the boiling point range is higher than the 95% by volume distillation temperature (270 ° C. or lower) of kerosene No. 1. Since it is wider than the boiling point range of No. 1 kerosene, an excellent yield can be obtained.
Since the 95% by volume distillation temperature of the fuel oil composition for an external combustion engine of the present embodiment depends on the 95% by volume distillation temperature of the distillate as a constituent component, 95% by volume in the present embodiment. Since the% distilling temperature is 271.0 ° C. or higher and lower than 310.0 ° C., it is wider than the boiling point range of No. 1 kerosene, and the yield from crude oil is higher than that of No. 1 kerosene.
From the viewpoint of improving the yield rate, the 95% by volume distillation temperature is preferably 277.0 ° C. or higher, more preferably 280.0 ° C. or higher, still more preferably 290.0 ° C. or higher, and from the viewpoint of improving flammability. Therefore, the upper limit value is preferably 308.0 ° C. or lower, more preferably 305.0 ° C. or lower.

(3) Flash point The flash point of the fuel oil composition for an external combustion engine of the present embodiment is 40.0 ° C. or higher. If the flash point is less than 40.0 ° C, handling safety is reduced. From the viewpoint of improving handling safety, the flash point is preferably 45.0 ° C. or higher, more preferably 48.0 ° C. or higher, still more preferably 50.0 ° C. or higher.
In the present specification, the flash point of the fuel oil composition for an external fuel machine and the heavy kerosene fraction is JIS K 2265-1: 2007 (crude oil and petroleum products-flash point test method-Part 1: tag sealing method). It is a value measured according to.

(4) Sulfur content The sulfur content of the fuel oil composition for an external combustion engine of the present embodiment is 3 mass ppm or more and 10 mass ppm or less. If the sulfur content is not within the above range, it becomes difficult to maintain storage stability, and corrosion may occur due to an increase in sulfur oxides in the exhaust gas. From the viewpoint of improving storage stability and suppressing the occurrence of environmental load and corrosion, the sulfur content is preferably 7 mass ppm or less, more preferably 5 mass ppm or less, still more preferably 4 mass ppm or less.
In the present specification, the sulfur content is a value measured according to JIS K2541-7: 2003 (crude oil and petroleum products-sulfur content test method-7: wavelength dispersion fluorescent X-ray fluorescence method).

(5) Fogging point The fogging point of the fuel oil composition for an external combustion engine of the present embodiment is -20.0 ° C. or lower. If the cloudiness point is higher than -20.0 ° C., the low temperature fluidity is lowered, the filter is likely to be clogged with the precipitated wax, and it is necessary to take measures such as heat retention. From the viewpoint of suppressing clogging of the filter by improving low-temperature fluidity in the cold winter season and eliminating the need for equipment such as heat retention, it is preferably -23.0 ° C or lower, more preferably -24.0 ° C. Below, it is more preferably -25.0 ° C. or lower. On the other hand, the lower limit is not particularly limited, but is usually -40.0 ° C. or higher.
In the present specification, the cloudiness point is a value measured according to JIS K2269: 1987 (pour point of crude oil and petroleum products and a method for testing the pour point of petroleum products).

(6) Total calorific value The total calorific value of the fuel oil composition for an external combustion engine of the present embodiment is 37,000 (kJ / L) or more. If the total calorific value is less than 37,000 (kJ / L), the fuel consumption is lowered and it becomes difficult to improve the fuel consumption. From the viewpoint of improving fuel efficiency, the total calorific value is preferably 37,010 (kJ / L) or more, more preferably 37,020 (kJ / L) or more. The upper limit is not particularly limited, but is preferably 37,100 (kJ / L) or less, more preferably 37,070 (kJ / L) or less from the viewpoint of flammability.
In the present specification, the total calorific value is measured and estimated according to JIS K2279: 2003 (crude oil and petroleum products-calorific value test method and calculation method-) ("6. Total calorific value estimation method, 6. 3 e) It is a value estimated by the calculation formula in the case of crude oil, kerosene, light oil, A heavy oil and B heavy oil specified in 1) ”.

Further, the fuel oil composition for an external combustion engine of the present embodiment is at least one selected from the following conditions (7) to (12) in addition to the above-mentioned properties and compositions (1) to (6). It is preferable that all of the following conditions (7) to (12) are particularly satisfied.
(7) The result of the petroleum product reaction test is neutral (8) Moisture content is 0.01% by volume or less (9) Ash content is 0.001% by mass or less (10) The kinematic viscosity at 30 ° C is 1.300 mm ² / S or more 2.400 mm ² / s or less (11) Density at 15 ° C. 0.7985 g / cm ³ or more 0.8020 g / cm ³ or less (12) Saturation content based on the total amount of the composition is 80.0% by volume or more. Olefin content is 0.3% by volume or less, 1-ring aromatic content is 20.0% by volume or less, 2-ring aromatic content is 2.0% by volume or less, and 3 or more rings aromatic content is 1.0% by volume. Hereinafter, each of the provisions (7) to (12) will be described in detail below.

(7) Petroleum Product Reaction Test The fuel oil composition for an external combustion engine of the present embodiment preferably has a neutral result of a petroleum product-reaction test according to JIS K 2252: 1998. By being neutral, it prevents corrosion of various devices that the fuel oil composition for the external combustion engine of the present embodiment comes into contact with, for example, fuel oil tanks, pipes, diesel engines, and auxiliary machines such as equipped pumps. Therefore, stable operation of the external combustion engine becomes possible more easily.

(8) Moisture content The water content of the fuel oil composition for an external combustion engine of the present embodiment is preferably 0.01% by volume or less. When the water content is within the above range, it is possible to suppress deterioration of storage stability, freezing, etc., and prevent clogging of the filter.
In the present specification, the water content is a value measured according to JIS K 2275-3: 2015 (crude oil and petroleum products-how to obtain water-Part 3: Karl Fischer titration method).

(9) Amount of ash The amount of ash in the fuel oil composition for an external combustion engine of the present embodiment is preferably 0.001% by mass or less. When the amount of ash is within the above range, wear of the burner tip can be further suppressed, and the environmental load due to exhaust gas can be reduced.
In the present specification, the ash content is a value measured according to JIS K 2272: 1998 (crude oil and petroleum products-ash content and sulfate ash content test method-).

(10) Dynamic Viscosity at 30 ° C. The kinematic viscosity of the fuel oil composition for an external combustion engine of the present embodiment at 30 ° C. is preferably 1.300 mm ² / s or more, more preferably 1.520 mm ² / s or more, and further. preferably 1.750mm ² / s or more, more preferably 1.850mm ² / s or more, preferably 2.400mm ² / s or less as the upper limit, more preferably 2.300mm ² / s or less, more preferably 2.250 mm ² / s or less. When the kinematic viscosity at 30 ° C. is within the above range, it becomes easy to adapt the fuel oil composition for an external combustion engine to the specification range of various devices such as a pump and a flow meter, and the combustibility is improved.
In the present specification, the kinematic viscosity at 30 ° C. is a value measured according to JIS K 2283: 2000 (a kinematic viscosity test method for crude oil and petroleum products).

(11) Density at 15 ° C. The density of the fuel oil composition for an external combustion engine of the present embodiment at 15 ° C. ^{is preferably 0.7985 g / cm 3} or more and 0.8020 g / cm ³ or less. Within the above range, it is possible to improve the profitability, improve the fuel efficiency by the calorific value, and improve the combustibility. From the same viewpoint as this, it is preferably 0.7990 g / cm ³ or more, more preferably 0.7995 g / cm ³ or more, and the upper limit is preferably 0.8015 g / cm ³ or less, more preferably 0.8013 g / cm. ^{It is 3} or less.
In the present specification, the density at 15 ° C. is a value measured according to JIS K 2249-1: 2011 (crude oil and petroleum products-how to obtain density-Part 1: vibration method).

(12) Composition The saturation content of the fuel oil composition for an external combustion engine of the present embodiment based on the total amount of the composition is preferably 80.0% by volume or more, more preferably 82.0% by volume or more, still more preferably 84. It is 0% by volume or more. The olefin content is preferably 0.3% by volume or less, more preferably 0.1% by volume or less. The aromatic content per ring is preferably 20.0% by volume or less, more preferably 17.5% by volume or less, still more preferably 15.0% by volume or less. The bicyclic aromatic content is preferably 2.0% by volume or less, more preferably 1.0% by volume or less, still more preferably 0.75% by volume or less. The aromatic content of 3 or more rings is preferably 1.0% by volume or less, more preferably 0.5% by volume or less, still more preferably 0.3% by volume or less. When the content of these components is within the above range, the flammability is particularly improved.
In the present specification, the saturated component, the olefin component, the monocyclic aromatic component, the bicyclic aromatic component, and the aromatic component having three or more rings are defined in JPI-5S-49-2007 as a petroleum product-hydrocarbon type. Test method-A value measured by a high performance liquid chromatography method.

(Heavy kerosene fraction)
The heavy kerosene fraction, which is the main component of the fuel oil composition for an external fuel according to the present embodiment, is a fraction obtained by hydrodesulfurizing a straight fraction obtained by atmospheric distillation of crude oil (hereinafter, "hydrodesulfurization"). It is a fraction that contains 90.0% by volume or more of (sometimes referred to as “fraction”) and satisfies all of the following conditions _{(a 1} ) to (e _1). If the above-mentioned heavy kerosene fraction is not contained, excellent low-temperature fluidity and combustibility cannot be obtained, stable supply cannot be obtained with a high yield rate, and fuel efficiency can be improved by a high calorific value. No fuel oil composition for external combustion engines can be obtained.
(A ₁ ) Initial distillation point is 140.0 ° C or higher (b ₁ ) 95% by volume distillation temperature is 271.0 ° C or higher and 300.0 ° C or lower (c ₁ ) Flash point is 40.0 ° C or higher (d ₁ ) Sulfur content is 3 mass ppm or more and 10 mass ppm or less (e ₁ ) Cloud point is -20.0 ° C or less

The hydrodesulfurization conditions for obtaining a hydrodesulfurized fraction by hydrodesulfurizing the straight distillate are as follows, for example. The hydrodesulfurization fraction can be obtained more easily by setting the following hydrodesulfurization conditions.
Reaction temperature: 250 ° C or higher and 390 ° C or lower, preferably 300 ° C or higher and 350 ° C or lower Hydrogen partial pressure; 1.0 MPa or higher and 10.0 MPa or lower, preferably 2.0 MPa or higher and 5.0 MPa or lower Hydrogen / raw material oil ratio; 50 Nm ³ / kL above 500 Nm ³ / kL or less, preferably 100 Nm ³ / kL or 300 Nm ³ / kL or less,
Liquid hourly space velocity; 0.1 hr ^-1 or more 10.0Hr ^-1 or less, preferably 1.0 hr ^-1 or more 8.0Hr ^-1 or less

(A ₁ ) Initial distilling point The initial distilling point of the heavy kerosene distillate used in this embodiment is 140.0 ° C. or higher. If the initial retaining point is not within the above range, handling safety will be reduced. From the viewpoint of improving handling safety, it is preferably 142.0 ° C. or higher, more preferably 145.0 ° C. or higher, and the upper limit is preferably 160.0 ° C. from the viewpoint of improving the yield and flammability. ° C. or lower, more preferably 155.0 ° C. or lower. Further, when the initial distillate of the heavy kerosene distillate is within the above range, the initial distillate of the fuel oil composition for an external combustion engine of the present embodiment is likely to be 140.0 ° C. or higher.

(B ₁ ) 95% by volume distilling temperature The 95% by volume distilling temperature of the heavy kerosene distillate used in this embodiment is 271.0 ° C. or higher and 300.0 ° C. or lower. As described above, by using a heavy kerosene fraction having a 95% by volume distillate temperature in the above range and a boiling point range wider than that of kerosene, as a result, the yield of the fuel oil composition for an external combustion engine of the present embodiment is obtained. Can be improved. The 95% by volume distillation temperature is preferably 273.0 ° C. or higher, more preferably 275.0 ° C. or higher from the viewpoint of improving the yield, and is preferably 290.0 ° C. as the upper limit from the viewpoint of improving flammability. ° C or lower, more preferably 280.0 ° C or lower. Further, when the 95% by volume distillation temperature of the heavy kerosene distillate is within the above range, the 95% by volume distillation temperature of the fuel oil composition for an external combustion engine of the present embodiment is 275.0 ° C. or higher and 310.0. It becomes easy to keep the temperature below ℃.

(C ₁ ) Flash point The flash point of the heavy kerosene fraction used in this embodiment is 40.0 ° C. or higher. If the flash point is not within the above range, handling safety will be reduced. From the viewpoint of improving handling safety, the flash point is preferably 42.0 ° C. or higher, more preferably 44.5 ° C. or higher. Further, when the flash point of the heavy kerosene fraction is within the above range, the flash point of the fuel oil composition for an external combustion engine of the present embodiment is likely to be 40.0 ° C. or higher.

(D ₁ ) Sulfur content The sulfur content of the heavy kerosene fraction used in this embodiment is 3 mass ppm or more and 10 mass ppm or less. If the sulfur content is not within the above range, it becomes difficult to maintain storage stability, and corrosion may occur due to an increase in sulfur oxides in the exhaust gas. From the viewpoint of improving storage stability and suppressing the occurrence of environmental load and corrosion, the sulfur content is preferably 8 mass ppm or less, more preferably 6 mass ppm or less, and the lower limit is preferably 4 mass ppm or more. Is. Further, when the sulfur content of the heavy kerosene fraction is within the above range, the sulfur content of the fuel oil composition for an external combustion engine of the present embodiment is likely to be 3 mass ppm or more and 10 mass ppm or less.

(E ₁ ) Cloudy point The cloudy point of the heavy kerosene fraction used in this embodiment is -20.0 ° C. or lower. If the cloudiness point is higher than -20.0 ° C., the low temperature fluidity is lowered, the filter is likely to be clogged with the precipitated wax, and it is necessary to take measures such as heat retention. From the viewpoint of suppressing clogging of the filter by improving low-temperature fluidity in the cold winter season and eliminating the need for equipment such as heat retention, the temperature is preferably -20.5 ° C or lower, and the lower limit is not particularly limited. No, but usually above -40.0 ° C. Further, when the clouding point of the heavy kerosene fraction is within the above range, the clouding point of the fuel oil composition for an external combustion engine of the present embodiment is likely to be set to -20.0 ° C. or lower.

The heavy kerosene fraction used in the present embodiment is at least selected from the following conditions _{(f 1} ) to (h ₁ ) in addition to the _{above-mentioned properties and compositions (a 1} ) to (e _1). It is preferable that one is satisfied, and it is particularly preferable that all of the following _{conditions (f 1} ) to (h ₁ ) are satisfied.

(F ₁ ) Density at 15 ° C. The density of the heavy kerosene distillate used in the present embodiment at 15 ° C. is preferably 0.7890 g / cm ³ or more, more preferably 0.7920 g / cm ³ or more, still more preferably 0.7920 g / cm 3 or more. It is 0.7940 g / cm ³ or more, and the upper limit is preferably 0.7980 g / cm ³ or less, more preferably 0.7970 g / cm ³ or less. When the density at 15 ° C. is within the above range, the profitability is improved, the fuel consumption is improved by the calorific value, and the combustibility is also improved.

(G ₁ ) Dynamic Viscosity at 30 ° C The kinematic viscosity of the heavy kerosene fraction used in the present embodiment at 30 ° C is preferably 1.300 mm ² / s or more, more preferably 1.400 mm ² / s or more, and further. It is preferably 1.500 mm ² / s or more, and the upper limit is preferably 1.600 mm ² / s or less, more preferably 1.550 mm ² / s or less, and further preferably 1.510 mm ² / s or less. When the kinematic viscosity at 30 ° C. is within the above range, it becomes easy to adapt the fuel oil composition for an external combustion engine to the specification range of various devices such as a pump and a flow meter, and the combustibility is improved.

(H ₁ ) Composition The saturated content of the heavy kerosene fraction used in the present embodiment based on the total amount of the composition is preferably 70.0% by volume or more, more preferably 75.0% by volume or more, still more preferably 78. It is 0% by volume or more, and the upper limit is preferably 90.0% by volume or less, more preferably 85.0% by volume or less, and further preferably 83.0% by volume or less. The olefin content is preferably 0.3% by volume or less, more preferably 0.1% by volume or less. The 1-ring aromatic content is preferably 25.0% by volume or less, more preferably 23.0% by volume or less, further preferably 20.0% by volume or less, and the 2-ring aromatic content is preferably 3.0% by volume or less. Below, more preferably 2.0% by volume or less, still more preferably 1.0% by volume or less, and the tricyclic aromatic content is preferably 1.0% by volume or less, more preferably 0.8% by volume or less, further. It is preferably 0.5% by volume or less. When the content of these components is within the above range, the flammability is particularly improved.

(Content of hydrodesulfurized fraction in heavy kerosene fraction)
The content of the hydrodesulfurized fraction in the heavy kerosene fraction is 90.0% by volume or more. If the content of the hydrodesulfurized fraction is not within the above range, an excellent yield cannot be obtained. The content of the hydrodesulfurized fraction in the heavy kerosene fraction is preferably 92.0% by volume or more, more preferably 95.0% by volume or more, and 100. It is more preferable that the amount is 0.0% by volume, that is, the total amount is hydrodesulfurized fraction.

(Other fractions that heavy kerosene fractions can contain)
In the present embodiment, the heavy kerosene fraction may contain other fractions in addition to the hydrodesulfurization fraction. Other fractions that can be used in combination with the hydrodesulfurization fraction include, for example, the following fractions.
(I) Distillate obtained by hydrodistilling crude oil at atmospheric pressure with an atmospheric distillation apparatus (also referred to as "direct distillation light oil fraction") is hydrolyzed and decomposed. (Ii) Crude oil is always distilled at atmospheric pressure. The gas oil fraction (also referred to as "vacuum gas oil fraction") obtained by vacuum distillation of the residue fraction obtained by pressure distillation (also referred to as "normal pressure distillation residual oil") with a vacuum distillation apparatus is hydrolyzed. Distillate (iii) Light oil fraction obtained by fluid contact decomposition of the residual oil obtained by directly desulfurizing the atmospheric distillation residual oil and / or the vacuum distillation residual oil with a desulfurization apparatus (“decomposed gas oil fraction”). Fraction obtained by hydrocracking (also referred to as)) (iv) Light oil fraction obtained by directly desulfurizing atmospheric distillation residual oil and / or vacuum distillation residual oil with a desulfurization apparatus (“direct desalination light oil distillate”). Fraction obtained by hydrocracking) (v) Of the aromatic solvents produced in petroleum chemical plants, the sulfur content is 10% by mass or less and the boiling point range is 140. Fraction of 0 ° C or higher and 350.0 ° C or lower

(Content of heavy kerosene fraction)
The content of the heavy kerosene fraction based on the total amount of the composition is preferably more than 60% by volume, more preferably 65% by volume or more, further preferably 72% by volume or more, and the upper limit is preferably less than 90% by volume. It is preferably 85% by volume or less, more preferably 80% by volume or less. If the content of heavy kerosene distillate is within the above range, the external combustion engine is equipped with a hydraulic spray burner that improves low-temperature fluidity, improves flammability, has a low rated combustion amount, and has a low spray oil pressure. It becomes more suitable as a fuel oil composition of the above, more stable supply is possible with a high yield rate, and it can contribute to improvement of fuel efficiency by having a higher calorific value.

(Paraffin hydrocarbon)
The fuel oil composition for an external combustion engine of the present embodiment contains _{a specific paraffinic hydrocarbon that satisfies all of the following conditions (a 2} ) to (e ₂ ) in an amount of more than 10% by volume and 40% by volume based on the total amount of the composition. It is necessary to include it in a content of less than%.
(A ₂ ) Saturation content is 99.0% by mass or more (b ₂ ) Sulfur content is 20 mass ppm or less (c ₂ ) Cloudy point is -50.0 ° C or less (d ₂ ) Dynamic viscosity at 30 ° C Is 5.00 mm ² / s or more and 20.0 mm ² / s or less (e ₂ ) The flash point is 70.0 ° C or more.

If the content of the paraffinic hydrocarbon is 10% by volume or less, the calorific value is reduced, so that the fuel consumption is lowered, it is difficult to improve the fuel consumption, and the low temperature fluidity is also lowered. On the other hand, when the content of the paraffinic hydrocarbon is 40% by volume or more, the flammability is lowered. From the viewpoint of improving the calorific value, improving the fuel efficiency, and improving the low temperature fluidity, the content of the paraffinic hydrocarbon based on the total amount of the composition is preferably 15% by volume or more, more preferably 20% by volume or more. The upper limit is preferably 35% by volume or less, more preferably 30% by volume or less.

Hereinafter, the performance of the paraffinic hydrocarbon used in the present embodiment will be described.
(A ₂ ) Saturation content The saturation content of paraffinic hydrocarbons must be 99.0% by volume or more. When the saturated content of the paraffinic hydrocarbon is less than 99.0% by volume, the low temperature fluidity is particularly lowered. From the viewpoint of improving low-temperature fluidity and combustibility, more stable supply by improving the yield, and improving fuel efficiency by calorific value, it is preferably 99.4% by volume or more, more preferably 99.9% by volume or more, and further. It is preferably 100.0% by volume.

(B ₂ ) Sulfur content The sulfur content of paraffinic hydrocarbons must be 20 mass ppm or less. If the sulfur content is greater than 20 mass ppm, it becomes difficult to maintain storage stability, and corrosion may occur due to an increase in sulfur oxides in the exhaust gas. From the viewpoint of improving storage stability and suppressing the occurrence of environmental load and corrosion, the sulfur content is preferably 10 mass ppm or less, more preferably 3 mass ppm or less, still more preferably 1 mass ppm or less. Further, when the sulfur content of the paraffinic hydrocarbon is within the above range, the sulfur content of the fuel oil composition for an external combustion engine of the present embodiment is likely to be 3 mass ppm or more and 10 mass ppm or less.

(C ₂ ) Fogging point The haze point of paraffinic hydrocarbons must be -50.0 ° C or lower. If the cloudiness point is higher than -50.0 ° C., the low temperature fluidity is lowered, the filter is likely to be clogged with the precipitated wax, and it is necessary to take measures such as heat retention. Further, when the clouding point of the paraffinic hydrocarbon is within the above range, the clouding point of the fuel oil composition for an external combustion engine of the present embodiment is likely to be -20.0 ° C. or lower.
In the present specification, the haze point is a value measured according to JIS K2269: 1987 (pour point of crude oil and petroleum products and haze point test method).

(D ₂ ) Dynamic Viscosity at 30 ° C. The kinematic viscosity of paraffinic hydrocarbons at 30 ° C ^{is required to be 5.00 mm 2} / s or more and 20.0 mm ² / s or less. If the kinematic viscosity at 30 ° C. is ^{larger than 20.0 mm 2} / s, the flammability is lowered. Further, if the kinematic viscosity at 30 ° C. is ^{less than 5.00 mm 2} / s, it becomes difficult to use the existing equipment (pump, flow meter) or the like as it is. From the viewpoint of improving flammability and facilitating the adaptation of the fuel oil composition for external combustion engines to the specification range of various devices such as pumps and flow meters, the kinematic viscosity of paraffinic hydrocarbons at 30 ° C. is preferably 5. 50 mm ² / s or more, more preferably 5.70mm ² / s or more, upper limit is preferably 19.9 mm ² / s or less, and more preferably not more than 19.7 mm ² / s.

(E ₂ ) Flash point The flash point of paraffinic hydrocarbons must be 70.0 ° C or higher. If the flash point is less than 70.0 ° C, handling safety is reduced. From the viewpoint of improving handling safety, the flash point is preferably 80.0 ° C., more preferably 90.0 ° C. or higher. Further, when the flash point of the paraffinic hydrocarbon is within the above range, the flash point of the fuel oil composition for an external combustion engine of the present embodiment is likely to be 40.0 ° C. or higher.
In the present specification, the flash point of the paraffinic hydrocarbon is a value measured according to JIS K 2265-3: 2007 (crude oil and petroleum products-flash point test method-Part 3: Pencil Stainless Sealing Method). be.

Further, the paraffinic hydrocarbon used in the present embodiment has the following properties and compositions (f ₂ ) to (h ₂ ) _{in addition to the above properties and compositions (a 2} ) to (e _2). be able to.
(F ₂ ) Density at 15 ° C. The density of the paraffinic hydrocarbon at 15 ° C. is preferably 0.8000 g / cm ³ or more, more preferably 0.8050 g / cm ³ or more, and the upper limit is preferably 0.8250 g / cm / cm. It is cm ³ or less, preferably 0.8200 g / cm ³ or less. When the density at 15 ° C. is within the above range, the profitability is improved, the fuel consumption is improved by the calorific value, and the combustibility is also improved.

(G ₂ ) Initial distilling point The initial distilling point of the paraffinic hydrocarbon is preferably 200.0 ° C. or higher, more preferably 210.0 ° C. or higher, still more preferably 220. The temperature is 0 ° C. or higher, and the upper limit is preferably 300.0 ° C. or lower, more preferably 285.0 ° C. or lower, still more preferably 235.0 ° C. or lower, from the viewpoint of improving the yield and flammability. Further, when the initial distillation point of the paraffin-based hydrocarbon is within the above range, the initial distillation point of the fuel oil composition for an external combustion engine of the present embodiment is likely to be 140.0 ° C. or higher.

(H ₂ ) End point The end point of the paraffin-based hydrocarbon is preferably 310.0 ° C. or higher, more preferably 320.0 ° C. or higher, still more preferably 345.0 ° C. or higher, and burns, from the viewpoint of improving the yield. From the viewpoint of improving the properties, the upper limit value is preferably 360.0 ° C. or lower, more preferably 355.0 ° C. or lower.

(Antioxidant)
The fuel oil composition for an external combustion engine of the present embodiment contains an antioxidant in the range of 20 mass ppm or more and 100 mass ppm or less as the content based on the total amount of the composition. If the above-mentioned antioxidant is not contained in the above-mentioned content, the storage stability may be lowered and the combustibility may be lowered. In addition, as an upper limit value, even if it is contained more than this, the addition effect is poor and it is economically disadvantageous.
The content of the antioxidant based on the total amount of the composition is preferably 25 mass ppm or more, more preferably 30 mass ppm or more, and the upper limit is from the viewpoint of efficiently improving the storage stability and improving the flammability. The value is preferably 80 mass ppm or less, more preferably 50 mass ppm or less.

The antioxidant used in the present embodiment can be used without particular limitation as long as it is widely used in fuel oil compositions. For example, antioxidants such as phenol-based antioxidants and amine-based antioxidants can be used. Is preferably mentioned. Further, in the present embodiment, one type of antioxidant may be used alone, or a plurality of types may be used in combination.

Examples of the phenolic antioxidant include 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol, 2,4-dimethyl-6-tert-butylphenol, 2,4,6. Monocyclic tert-alkylphenolic antioxidants such as -tri-tert-butylphenol, 2,6-di-tert-butyl-4- (N, N-dimethylaminomethyl) phenol; 4,4'-methylenebis (2) , 6-di-tert-butylphenol), 4,4'-isopropyridenebis (2,6-di-tert-butylphenol), 2,2'-methylenebis (4-methyl-6-tert-butylphenol), 4, 4'-bis (2,6-di-tert-butylphenol), 4,4'-bis (2-methyl-6-tert-butylphenol), 2,2'-methylenebis (4-ethyl-6-tert-butylphenol) ), 4,4'-Butylidenebis (3-methyl-6-tert-butylphenol) and other polycyclic tert-alkylphenol-based antioxidants.

Examples of amine-based antioxidants include monoalkyldiphenylamine-based antioxidants such as monooctyldiphenylamine and monononyldiphenylamine; 4,4'-dibutyldiphenylamine, 4,4'-dipentyldiphenylamine, 4,4'-dihexyldiphenylamine, 4 , 4'-Diheptyldiphenylamine, 4,4'-dioctyldiphenylamine, 4,4'-dinonyldiphenylamine and other dialkyldiphenylamine-based antioxidants; tetrabutyldiphenylamine, tetrahexyldiphenylamine, tetraoctyldiphenylamine, tetranonyldiphenylamine and the like Polyalkyldiphenylamine-based antioxidants; examples thereof include naphthylamine-based antioxidants such as α-naphthylamine, phenyl-α-naphthylamine, and butylphenyl-α-naphthylamine.

In the present embodiment, a phenolic antioxidant having a tert-alkyl group is preferable, and a monocyclic phenolic antioxidant having a tert-alkyl group is more preferable, among which 2,6-di-tert-butylphenol, 2,4-Dimethyl-6-tert-butylphenol and 2,6-di-tert-butyl-4-methylphenol are preferred.

(Other additives)
The fuel oil composition for an external combustion engine of the present embodiment includes a low-temperature fluidity improver and a lubricant as other additives other than the above-mentioned antioxidant, if necessary, as long as the above-mentioned properties can be maintained. Various additives such as a property improver, a cetane number improver, a combustion accelerator, a cleaning agent, a sludge dispersant, and a fungicide can be appropriately selected and blended. In addition, coumarin may be blended from the viewpoint of light oil take-back tax.

(Use)
The fuel oil composition for an external combustion engine of the present embodiment has high storage stability, exhibits excellent low-temperature fluidity even in a cold region in a severe cold season, is excellent in oxidative stability, and is also excellent in flammability. Therefore, it shows excellent combustibility even in an external combustion engine equipped with a hydraulic spray burner with a small rated combustion amount and a low spray oil pressure, and a more stable supply with a higher yield is possible, and a higher calorific value is generated. It has the characteristic that it can contribute to the improvement of fuel efficiency. Specifically, it is suitably used for external combustion engines such as steam boilers, hot water boilers, hot air heaters, absorption chiller / hot water machines, and hot water generators.
Further, the fuel oil composition for an external combustion engine of the present embodiment has a rated combustion amount of 10.0 L / hour or less and a spray hydraulic pressure of 0.90 MPa or less, preferably a rated combustion amount of 7, among the above-mentioned external combustion engines. When used for an external combustion engine equipped with a hydraulic spray burner having a spray hydraulic pressure of 0.0 L / hour or less and a spray hydraulic pressure of 0.80 MPa or less, more preferably a rated combustion amount of 5.0 L / hour or less and a spray hydraulic pressure of 0.70 MPa or less. , The above characteristics are particularly exhibited.

[Manufacturing method of fuel oil composition for external combustion engine]
The method for producing a fuel oil composition for an external fuel according to the present embodiment is a method for producing a fuel oil composition for an external fuel that satisfies all of the above (1) to (6), and is atmospheric distillation of crude oil. A heavy kerosene fraction that satisfies all of the above conditions _{(a 1} ) to (e ₁ ), which contains 90.0% by volume or more of the straight distillate obtained by hydrocarbonation and desulfurization, and the above (a). ₂₎ ~ (e 2 conditions and paraffinic hydrocarbons and antioxidants which satisfies both _of) the content of the total amount of the composition of the paraffinic hydrocarbon is less than 10 volume percent 40 volume%, the oxidation It is characterized in that the content of the inhibitor based on the total amount of the composition is 20 mass ppm or more and 100 mass ppm or less. The fuel oil composition for an external combustion engine of the present embodiment can be easily produced by the production method of the present embodiment.

Specifically, it is preferable to have the following steps.
(A) Step of obtaining a distillate obtained by hydrodesulfurizing the straight distillate obtained by atmospheric distillation of crude oil (B) With a heavy kerosene distillate containing 90.0% by volume or more of the distillate obtained in the previous step. Paraffinic hydrocarbons so that the content based on the total amount of the composition is more than 10% by volume and less than 40% by volume, and antioxidants so that the content based on the total amount of the composition is 20% by mass or more and 100% by mass or less. And the process of blending

In the step (A), the fraction obtained by hydrogenating and desulfurizing the straight fraction obtained by atmospheric distillation of crude oil is another fraction, for example, if the content of the fraction is 90.0% by volume or more. The above (i) direct distillate light oil fraction, (ii) decompressed light oil distillate, (iii) cracked light oil distillate obtained by hydrocracking, and (iv) directly desorbed light oil distillate are hydrocracked. Of the fractions obtained from the above and (v) aromatic solvents produced in petrochemical plants, the sulfur content is 10% by mass or less and the boiling point range is 140.0 ° C or higher and 350.0 ° C or lower. Various fractions such as fractions may be mixed.

Further, in the step (B), the order of blending the heavy kerosene fraction, the paraffinic hydrocarbon, and the antioxidant is not particularly limited and may be blended at the same time, or the heavy kerosene fraction and the paraffinic distillate may be blended at the same time. An antioxidant may be blended after blending with a hydrocarbon, or a paraffinic hydrocarbon and an antioxidant may be blended and then blended with a heavy kerosene fraction.

Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these examples. The properties of each base material were determined according to the following method.

[Measurement of properties and composition]
Various properties and compositions of the heavy kerosene fraction, the paraffinic hydrocarbon, and the fuel oil composition for the external combustion engine of the present embodiment were measured by the following methods.
-Distillation properties (initial distillation point, 95% by volume distillation temperature and end point): Measured according to JIS K2254: 1998 (Petroleum products-distillation test method-).
-Measured according to the flash point of heavy kerosene fraction and fuel oil composition for external fuel: JIS K 2265-1: 2007 (crude oil and petroleum products-flash point test method-Part 3: tag sealing method). ..
-Flash point of paraffinic hydrocarbon: Measured according to JIS K 2265-3: 2007 (Crude oil and petroleum products-Flash point test method-Part 3: Penschemaltens sealing method).
-Sulfur content: Measured according to JIS K2541-7: 2003 (crude oil and petroleum products-sulfur content test method-Part 7: wavelength dispersion fluorescent X-ray fluorescence method).
-Cloudy point: Measured according to JIS K2269: 1987 (pour point of crude oil and petroleum products and cloudy point test method).
-Total calorific value: Measured and estimated according to JIS K2279: 2003 (crude oil and petroleum products-calorific value test method and calculation method-) ("6. Total calorific value estimation method, 6.3 e) 1) (Estimated by the calculation formula for crude oil, kerosene, light oil, A heavy oil and B heavy oil) specified in "".
-Petroleum product reaction test: Measured by a petroleum product-reaction test according to JIS K 2252: 1998.
-Moisture content: Measured according to JIS K 2275-3: 2015 (crude oil and petroleum products-how to determine water-Part 3: Karl Fischer titration method).
-Ash content: Measured according to JIS K 2272: 1998 (crude oil and petroleum products-ash content and sulfate ash content test method-).
-Dynamic viscosity at 30 ° C.: Measured according to JIS K 2283: 2000 (kinematic viscosity test method for crude oil and petroleum products).
-Density at 15 ° C.: Measured according to JIS K 2249-1: 2011 (crude oil and petroleum products-how to determine density-Part 1: vibration method).
-Composition: Saturated content, olefin content, 1-ring aromatic component, 2-ring aromatic component and 3 or more ring aromatic components are specified in JPI-5S-49-2007, and petroleum products-hydrocarbon type test method- It was measured by a high performance liquid chromatography method.

[Performance evaluation criteria]
The following performances 1 to 4 were evaluated. If there was a C rating in any of the items, the overall rating was a C rating (failed).
1. 1. Combustibility (1) Evaluation model, conditions / evaluation model; warm air warmer ("House Kaonki HK-1527", manufactured by Nepon Inc., rated combustion amount 4.9L / hour, on / off control)
-Fuel spray pressure: 0.69 MPa (hydraulic spray burner)
・ Band shutter opening: Adjust the exhaust gas oxygen concentration to 2.8 ± 0.2% ・ Fuel heating burner front heater; Off (2) Evaluation items 1 hour continuous combustion, 15 minutes fire extinguishing is repeated as one cycle After burning for 500 hours, the following items were evaluated.
・ Ignition: No visual delay in ignition ・ Combustibility; Measure the soot concentration (Baccarakka smoke number; SN) in the exhaust gas with the Baccaraca smoke tester The smaller the soot concentration (SN), the better the flammability. Indicates that Further, the SN was read in 0.5 increments with an intermediate soot concentration of 0.5 with respect to the standard (integer).
(3) Evaluation Criteria A: No visual ignition delay and soot concentration (SN) of 0.5 or less B: No visual ignition delay and soot concentration (SN) of more than 0.5 and 1.0 or less C: Above apart from

2. Storage stability (1) Evaluation item In accordance with ASTM D4625, after storing in the dark at 43 ° C for 3 weeks (corresponding to storage at room temperature for approximately 3 months), dry sludge is measured by the All Fisheries Federation A heavy oil dry sludge measurement method. It was measured according to (Z ・ G ・ ST-1010).
(2) Evaluation criteria A: Dry sludge is 1 mg / 100 mL or less C: Other than the above

3. 3. Low-temperature fluidity (1) Evaluation item The oil flow limit temperature was measured in accordance with the low-temperature fluidity test method standard (actual machine simulation method) for heavy oil A of JPI-5S-47-96. The oil flow limit temperature is the minimum oil temperature at which filter clogging did not occur due to the wax deposited at a low temperature. If the oil temperature is lowered below the oil flow limit temperature, the possibility of filter blockage due to wax becomes very high.
(2) Evaluation criteria A: Oil flow limit temperature is -25.0 ° C or less B: Oil flow limit temperature is over -25.0 ° C -20.0 ° C or less C: Other than the above

4. Fuel efficiency improvement (1) Evaluation items The total calorific value was estimated by the above method.
(2) Evaluation criteria Based on the total calorific value, evaluation was made according to the following criteria.
A: Total calorific value is 37,020 kJ / L or more B: Total calorific value is 37,000 kJ / L or more and less than 37,020 kJ / L C: Total calorific value is less than 37,000 kJ / L

(Manufacturing of heavy kerosene fraction)
The straight kerosene fraction obtained by atmospheric distillation of crude oil was hydrodesulfurized at a reaction temperature (about 340 ° C.) at which the sulfur content was 5 mass ppm to obtain a heavy kerosene fraction. The properties and composition of the obtained heavy kerosene fraction were measured by the above method. The results are shown in Table 1.

[Examples 1 to 5, Comparative Examples 1 to 6]
The heavy kerosene fraction having the properties and composition shown in Table 1 and the paraffinic hydrocarbon having the properties and composition shown in Table 1 are blended so as to have the contents shown in Tables 2 and 3. To prepare a mixed oil, 2,6-di-tert-butyl-4-methylphenol was blended as an antioxidant so as to be 30 mass ppm with respect to 100 parts by mass of the mixed oil, and the fuel oil was added. The composition was obtained. The properties and evaluation results of the obtained fuel oil composition are shown in Tables 2 and 3.

As shown in Table 2, the fuel oil composition for an external combustion engine of the present embodiment has good flammability, storage stability, low-temperature fluidity, and fuel efficiency improvement property, and is used in a cold region in a severe cold season. Also shows excellent low-temperature fluidity, shows excellent combustibility even in an external combustion engine equipped with a hydraulic spray burner with a small rated combustion amount and low spray oil, and enables more stable supply with a higher yield rate. It was confirmed that it can contribute to the improvement of fuel efficiency by having a higher calorific value.
On the other hand, the compositions of Comparative Example 1 containing no paraffinic hydrocarbon and Comparative Examples 2 and 4 having a small content of paraffinic hydrocarbon had a small calorific value and were insufficient in terms of fuel efficiency improvement. .. The composition of Comparative Example 3 having a large content of paraffinic hydrocarbons has a high 95% by volume distillation temperature, which is insufficient in terms of flammability, and although it contains paraffinic hydrocarbons, the 95% by volume distillation temperature is high. The composition of Comparative Example 5 was also insufficient in terms of flammability. Further, the oil composition of Comparative Example 6 containing no antioxidant in Example 1 was insufficient in terms of storage stability.

The fuel oil composition for an external combustion engine of the present embodiment has excellent stability even in long-term storage, exhibits excellent low-temperature fluidity even in a cold region in a severe cold season, has a small rated combustion amount, and has a low spray hydraulic pressure. It shows excellent combustibility even in an external combustion engine equipped with a hydraulic spray burner, can provide a stable supply with a high yield rate, and can contribute to improving fuel efficiency by having a high calorific value. Therefore, it is possible to solve the shortage of kerosene and kerosene distillate, which are in great demand in winter in cold regions.
The fuel oil composition for an external combustion engine of the present embodiment is suitably used for an external combustion engine such as a steam boiler, a hot water boiler, a hot air heater, an absorption type cold / hot water machine, and a hot water generator, and in particular, rated combustion. When used in a steam external combustion engine equipped with a hydraulic spray type burner having an amount of 10.0 L / hour or less and a spray hydraulic pressure of 0.90 MPa or less, the above characteristics are exhibited, and thus it is particularly preferably used.

Claims (4)

A heavy kerosene fraction that satisfies all of the following conditions _{(a 1} ) to (e ₁ ), containing 90.0% by volume or more of the direct distillate obtained by atmospheric distillation of crude oil hydrodesulfurized. following _{(a 2) ~ (e 2} ) conditions include paraffinic hydrocarbons and antioxidant satisfies all the content of the total amount of the composition of the paraffinic hydrocarbon is 10 volume percent 40 volume% Fuel oil for external combustion engines, which is less than, and the content of the hydrocarbon composition based on the total amount is 20 mass ppm or more and 100 mass ppm or less, and all of the following conditions (1) to (6) are satisfied. Composition.
(A ₁ ) The initial distillation point is 140.0 ° C. or higher (b ₁ ) 95% by volume distillation temperature is 271.0 ° C. or higher and 300.0 ° C. or lower (c ₁ ) The ignition point is 40.0 ° C. or higher (d ₁ ). Sulfur content is 3% by mass or more and 10% by mass or less (e ₁ ) Cloud point is -20.0 ° C or less (a ₂ ) Saturation content is 99.0% by volume or more (b ₂ ) Sulfur content is 20 mass ppm or less (c ₂ ) Cloud point is -50.0 ° C or less (d ₂ ) Dynamic viscosity at 30 ° C is 5.00 mm ² / s or more and 20.0 mm ² / s or less (e ₂ ) Flamm point is 70. 0 ° C or higher (1) Initial distillation point of 140.0 ° C or higher (2) 95% by volume distillation temperature of 275.0 ° C or higher and lower than 310.0 ° C (3) Flammability of 40.0 ° C or higher (4) Sulfur Content content is 3% by mass or more and 10% by mass or less (5) Clouding point is -20.0 ° C or less (6) Total calorific value is 37,000 (kJ / L) or more The fuel oil composition for an external combustion engine according to claim 1, further satisfying at least one selected from the following conditions (7) to (12).
(7) The result of the petroleum product reaction test is neutral (8) Moisture content is 0.01% by volume or less (9) Ash content is 0.001% by mass or less (10) The kinematic viscosity at 30 ° C is 1.300 mm ² / S or more 2.400 mm ² / s or less (11) Density at 15 ° C. 0.7985 g / cm ³ or more 0.8020 g / cm ³ or less (12) Saturation content based on the total amount of the composition is 80.0% by volume or more. Olefin content is 0.3% by volume or less, monocyclic aromatic content is 20.0% by volume or less, bicyclic aromatic content is 2.0% by volume or less, and aromatic content of 3 or more rings is 1.0% by volume. Less than The fuel oil composition for an external combustion engine according to claim 1 or 2, which is used for an external combustion engine equipped with a hydraulic spray burner having a rated combustion amount of 10.0 L / hour or less and a spray oil pressure of 0.9 MPa or less. A heavy kerosene fraction that satisfies all of the following conditions _{(a 1} ) to (e ₁ ), containing 90.0% by volume or more of the direct distillate obtained by atmospheric distillation of crude oil hydrodesulfurized. If, following _{(a 2) ~ (e 2} ) conditions and paraffinic hydrocarbons and antioxidants which satisfies both the content of total amount of the composition of the paraffinic hydrocarbon is 10 volume percent 40 volume For external fuel machines that satisfy all of the following conditions (1) to (6), which are blended so that the content of the antioxidant is less than 20% by mass and 100% by mass or less based on the total amount of the composition. A method for producing a fuel oil composition.
(A ₁ ) Initial distillation point is 140.0 ° C. or higher (b ₁ ) 95% by volume distillation temperature is 271.0 ° C. or higher and 300.0 ° C. or lower (c ₁ ) Flammability point is 40.0 ° C. or higher (d ₁ ) Sulfur content is 3% by mass or more and 10% by mass or less (e ₁ ) Cloud point is -20.0 ° C or less (a ₂ ) Saturation content is 99.0% by volume or more (b ₂ ) Sulfur content is 20 mass ppm or less (c ₂ ) Cloud point is -50.0 ° C or less (d ₂ ) Dynamic viscosity at 30 ° C is 5.00 mm ² / s or more and 20.0 mm ² / s or less (e ₂ ) Flamm point is 70. 0 ° C or higher (1) Initial distillation point of 140.0 ° C or higher (2) 95% by volume distillation temperature of 275.0 ° C or higher and lower than 310.0 ° C (3) Flammability of 40.0 ° C or higher (4) Sulfur Content content is 3% by mass or more and 10% by mass or less (5) Clouding point is -20.0 or less (6) Total calorific value is 37,000 (kJ / L) or more