JP2017114948A - Fuel oil composition for outer combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel composition for outer combustion engine exhibiting excellent stability in long term storage, exhibiting excellent low temperature fluidity even in cold district during midwinter, exhibiting excellent combustibility even in outer combustion engine mounting oil pressure spray type burner less in low rating combustion amount and in spray oil pressure and obtained at high yield.SOLUTION: The fuel oil composition for outer combustion engine satisfies all of following (1) to (7). (1) content of distillate by hydrodesulfurization of straight run distillate obtained with atmospheric distillation device for raw oil is 90 vol.% or more based on total volume of the fuel oil composition for outer combustion engine. (2) first drop point is 140.0°C or more. (3) 95% distillate temperature is 271.0°C to 300.0°C. (4) flash point is 45.0°C or more. (5) sulfur percentage content is 3 mass.ppm to 10 mass.ppm based on total mass of the fuel oil composition for outer combustion engine. (6) clouding point is -20°C or less. (7) antioxidant added amount is 20 mass.ppm to 100 mass.ppm based on total amount of the fuel oil composition for outer combustion engine.SELECTED DRAWING: None

Description

  The present invention relates to a fuel oil composition for an external combustor used in an external combustor such as a boiler or a hot air heater. Specifically, the present invention relates to a high yield, excellent storage stability and combustibility, The present invention relates to a fuel oil composition for an external combustor that is excellent in low-temperature fluidity even in a severe cold season.

As fuel oil compositions for external combustors such as boilers, hot air heaters, industrial furnaces, etc., mainly kerosene (JIS K 2203), heavy oil A (type 1 heavy oil of JIS K 2205) and heavy oil C (JIS K 2205). Are used).
Kerosene is a fuel oil composition that has an extremely low content of sulfur, nitrogen, and residual carbon, has a low environmental impact due to combustion, and is excellent in low-temperature fluidity. Kerosene is excellent in flammability even in an external combustor equipped with a hydraulic spray burner having a low rated combustion amount and a low spray hydraulic pressure. However, in cold regions in winter, kerosene demand for indoor heating is high, and special consideration is necessary for stable supply.
A heavy oil is generally excellent in supply stability and has an advantage of higher calorific value than kerosene. However, for heavy fuel oil A, consideration may be required for handling facilities in order to prevent filter clogging due to precipitation of wax in the cold region of cold regions. In addition, A heavy oil needs to be improved in combustibility when used in an external combustor equipped with a hydraulic spray burner having a low rated combustion amount and a low spray hydraulic pressure.
C heavy oil has a higher calorific value than A heavy oil. However, since it has a high viscosity, it is inconvenient to handle such as requiring heating equipment during use. In addition, because C heavy oil has low combustibility, it cannot be used for an external combustor equipped with a hydraulic spray burner having a low rated combustion amount and low spray hydraulic pressure. Furthermore, C heavy oil has the disadvantages of high sulfur content, nitrogen content and residual carbon content, and a large environmental load.
For the purpose of contributing to the stable supply of fuel oil compositions for external combustion machines in winter, the present inventors have so far shown excellent stability in long-term storage and excellent in cold regions in severe cold seasons. A fuel oil composition for an external combustor that exhibits low temperature fluidity, excellent combustibility even in an external combustor equipped with a hydraulic spray burner with a low rated combustion amount and low spray hydraulic pressure, and is obtained with high yield Has been proposed (see Patent Documents 1 and 2).

JP 2004-182744 A JP 2004-182745 A

However, it is desired to further improve the yield of the fuel oil composition for an external combustor and further stabilize the supply of the fuel oil composition for the external combustor.
Therefore, the present invention exhibits excellent stability during long-term storage, exhibits excellent low-temperature fluidity even in cold regions in severe cold seasons, and is equipped with a hydraulic spray burner with a low rated combustion amount and low spray hydraulic pressure. An object of the present invention is to provide a fuel oil composition for an external combustor that exhibits excellent combustibility even in a combustor and can be obtained with a high yield.

As a result of intensive studies in view of the above problems, the present inventors have found that a fuel oil composition for an external combustor having a specific composition and properties can solve the above problems.
The present invention is as follows.
[1] A fuel oil composition for an external combustor that satisfies all of the following (1) to (7).
(1) The content of a fraction obtained by hydrodesulfurizing a straight fraction obtained by an atmospheric distillation unit of crude oil is 90% by volume or more with respect to the total volume of the fuel oil composition for the external combustor. (2) Initial distillation (3) 95% distillation temperature is 271.0 ° C or higher and 300.0 ° C or lower (4) Flash point is 45.0 ° C or higher (5) Sulfur content is for the above external combustor 3 mass ppm or more and 10 mass ppm or less with respect to the total mass of the fuel oil composition (6) Cloud point is −20 ° C. or less (7) The amount of addition of the antioxidant is based on the total mass of the fuel oil composition for the external combustion machine 20 mass ppm or more and 100 mass ppm or less [2] The antioxidant is 2,6-ditertiary butylphenol, 2,4-dimethyl-6-tertiary butylphenol, and 2,6-ditertiary butyl-4-methylphenol. And at least one selected from the group consisting of The fuel oil composition for an external combustor according to the above [1].
[3] The fuel oil composition for an external combustor according to the above [1] or [2], which satisfies at least one of the following (8) to (13).
(8) The result of the petroleum product reaction test according to JIS K 2252 is neutral. (9) The moisture content is 0.01% by volume or less with respect to the total volume of the fuel oil composition for an external combustor. The residual carbon content of 0.001% by mass or less (11) 10% residual oil with respect to the total mass of the fuel oil composition for an external combustion machine is 0.001% with respect to the total mass of the fuel oil composition for an external combustion engine. 01% by mass or less (12) Kinematic viscosity at 30 ° C. of 1.30 mm ² / s or more and 1.70 mm ² / s or less (13) With respect to the total volume of the fuel oil composition for the external combustion machine, The saturated content in the fuel oil composition is 75.0% by volume or more, the olefin content is 0.3% by volume or less, the 1-ring aromatic content is 25.0% by volume or less, the 2-ring aromatic content is 3.0% or less, The tricyclic aromatic content is 0.3% by volume or less [4] The above [1] or [2 that satisfies all of the following (8) to (13) Outer 燃機 fuel oil composition according to.
(8) The result of the petroleum product reaction test according to JIS K 2252 is neutral. (9) The moisture content is 0.01% by volume or less with respect to the total volume of the fuel oil composition for an external combustor. The residual carbon content of 0.001% by mass or less (11) 10% residual oil with respect to the total mass of the fuel oil composition for an external combustion machine is 0.001% with respect to the total mass of the fuel oil composition for an external combustion engine. 01% by mass or less (12) Kinematic viscosity at 30 ° C. of 1.30 mm ² / s or more and 1.70 mm ² / s or less (13) With respect to the total volume of the fuel oil composition for the external combustion machine, The saturated content in the fuel oil composition is 75.0% by volume or more, the olefin content is 0.3% by volume or less, the 1-ring aromatic content is 25.0% by volume or less, the 2-ring aromatic content is 3.0% or less, The tricyclic aromatic content is 0.3 vol% or less. [5] The rated combustion amount is 10.0 L / hour or less and the spray hydraulic pressure is 0.90 MP. The following hydraulic spray burner above for use in mounting the outer 燃機 [1] ~ outer 燃機 fuel oil composition according to any one of [4].

According to the present invention, it has excellent stability in long-term storage, exhibits excellent low-temperature fluidity even in cold regions in severe cold seasons, and is equipped with a hydraulic spray burner having a low rated combustion amount and low spray hydraulic pressure. It is possible to provide a fuel oil composition for an external combustor that exhibits excellent combustibility in a combustor and can be obtained with a high yield.
In addition, the good combustibility, excellent storage stability, and excellent low-temperature fluidity of the fuel oil composition for an external combustor according to the present invention can contribute to the stable supply of kerosene fractions that are in great demand in cold regions in winter. It becomes possible.

Hereinafter, the present invention will be described more specifically.
The present invention relates to a fuel oil composition for an external combustor that satisfies both the composition and properties defined in the following (1) to (7) (hereinafter sometimes referred to as “the oil composition of the present invention”).
Oil composition of the present invention (1) The content of a fraction obtained by hydrodesulfurizing a straight fraction obtained by an atmospheric distillation apparatus of crude oil is 90% by volume with respect to the total volume of the fuel oil composition for an external combustor. (2) Initial boiling point is 140.0 ° C or higher (3) 95% distillation temperature is 271.0 ° C or higher and 300.0 ° C or lower (4) Flash point is 45.0 ° C or higher (5) Sulfur content Is 3 mass ppm or more and 10 mass ppm or less with respect to the total mass of the fuel oil composition for an external combustor. (6) Cloud point is -20 ° C. or less. (7) The amount of antioxidant added is the fuel oil composition for the external combustor. 20 mass ppm or more and 100 mass ppm or less with respect to the total mass of the object

[Fuel oil composition for external combustion equipment]
(Properties and composition of fuel oil composition for external combustion equipment)
The fuel oil composition for an external combustor of the present invention (hereinafter sometimes simply referred to as an oil composition) satisfies all of the compositions and properties defined in the following (1) to (7).
(1) Content of fraction obtained by hydrodesulfurization of straight fraction obtained by atmospheric distillation unit of crude oil Hydrodesulfurization of straight fraction obtained by atmospheric distillation unit of crude oil in the oil composition of the present invention The content of the cut fraction is 90% by volume or more, preferably 95% by volume or more, based on the total volume of the oil composition.
Since the 95% distillation temperature described later in the fuel oil composition for an external combustor according to the present invention is higher than the 95% distillation temperature (up to 270 ° C.) of kerosene, the boiling range of the straight distillation fraction is that of kerosene. It becomes wider than the boiling range. For this reason, the yield with respect to the crude oil of the above-mentioned straight cut becomes higher than the yield with respect to the crude oil of kerosene. Therefore, the yield of the oil composition of the present invention can be reduced to kerosene by setting the content of the fraction obtained by hydrodesulfurizing a straight fraction having a higher yield than kerosene to 90% by volume or more. It can be higher than that.

The 95% (95% by volume) distillation temperature of the straight fraction obtained by the crude oil atmospheric distillation apparatus is 271 ° C or higher and 300.0 ° C or lower, preferably 273 ° C, from the viewpoint of securing the yield. It is 290 ° C. or less, more preferably 275 ° C. or more and 285 ° C. or less, further preferably 276 ° C. or more and 285 ° C. or less, further preferably 277 ° C. or more and 285 ° C. or less, and further preferably 278 ° C. or more and 285 ° C. ° C or lower, more preferably 279 ° C or higher and 285 ° C or lower.
The 95% distillation temperature can be measured according to JIS K 2254 (petroleum and petroleum products-distillation test method).

The hydrodesulfurization conditions for hydrodesulfurizing the straight fraction are, for example, as follows.
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 / feed 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

The oil composition of the present invention may further contain the following fraction as a base material within the range satisfying the properties defined in (2) to (7) described later.
(I) A fraction obtained by hydrocracking a light oil fraction (straight-run gas oil fraction) obtained by atmospheric distillation of crude oil with an atmospheric distillation apparatus (ii) Obtained by atmospheric distillation of crude oil with an atmospheric distillation apparatus A fraction obtained by hydrocracking a gas oil fraction (vacuum gas oil fraction) obtained by subjecting the resulting residue fraction (atmospheric distillation residue oil) to vacuum distillation with a vacuum distillation apparatus (iii) atmospheric distillation residue oil and / or vacuum A fraction obtained by hydrocracking a light oil fraction (cracked gas oil) obtained by fluid catalytic cracking of a residue fraction obtained by directly desulfurizing a distillation residue oil (iv) An atmospheric distillation residue oil and / or a vacuum distillation residue oil A fraction obtained by hydrocracking a gas oil fraction obtained by desulfurization treatment directly in a desulfurization unit (direct degasification gas oil fraction) (v) an isoparaffinic solvent produced in a petrochemical factory, an aromatic Among the solvents, the sulfur content is 100 ppm or less and the boiling point range is 140.0 ° C. or more 3 Fraction below 20.0 ° C

(2) Initial boiling point From the viewpoint of ensuring safety in handling, the initial boiling point in the oil composition of the present invention is 140.0 ° C or higher, preferably 145.0 ° C or higher, ensuring the yield. From this viewpoint, it is preferably 160 ° C. or lower, more preferably 145.0 ° C. or higher and 160 ° C. or lower.
The initial boiling point can be measured according to JIS K 2254 (petroleum and petroleum products—distillation test method).

(3) 95% distillation temperature The 95% (95% by volume) distillation temperature in the oil composition of the present invention is 271 ° C or higher and 300.0 ° C or lower from the viewpoint of securing the yield and maintaining the combustibility. Yes, preferably 273 ° C. or higher and 290 ° C. or lower, more preferably 275 ° C. or higher and 285 ° C. or lower, further preferably 276 ° C. or higher and 285 ° C. or lower, more preferably 277 ° C. or higher and 285 ° C. or lower, Preferably they are 278 degreeC or more and 285 degrees C or less, More preferably, they are 279 degreeC or more and 285 degrees C or less. In particular, since the 95% distillation temperature in the oil composition of the present invention is higher than the 95% distillation temperature (up to 270 ° C.) of kerosene, the yield of the oil composition of the present invention relative to the feed oil is It is higher than the yield for oil.
The 95% distillation temperature can be measured according to JIS K 2254 (petroleum and petroleum products-distillation test method).

(4) Flash point The flash point of the oil composition of this invention is 45.0 degreeC or more from a viewpoint of ensuring the safety on handling.
The flash point can be measured according to JIS K 2265 (crude oil and petroleum products-flash point test method).

(5) Sulfur content The sulfur content in the oil composition of the present invention is the total oil composition of the present invention from the viewpoint of maintaining storage stability and reducing the environmental burden due to sulfur oxides in the exhaust gas. It is 3 mass ppm or more and 10 mass ppm or less with respect to mass, Preferably it is 4 mass ppm or more and 8 mass ppm or less.
The sulfur content can be measured according to JIS K2541 (crude oil and petroleum products-sulfur content test method).

(6) Cloud point The cloud point in the oil composition of the present invention ensures low-temperature fluidity and suppresses filter clogging due to precipitated wax even in the cold region of cold districts, without supporting facilities such as heat retention. From the viewpoint of performing, it is −20 ° C. or lower.
The cloud point can be measured in accordance with JIS K 2269 (pour point of crude oil and petroleum products and petroleum product cloud point test method).

(7) Antioxidant addition amount The antioxidant addition amount in the oil composition of the present invention is based on the total mass of the oil composition from the viewpoint of maintaining storage stability, ensuring combustibility and reducing additive costs. It is 20 mass ppm or more and 100 mass ppm or less, preferably 25 mass ppm or more and 80 mass ppm or less, more preferably 30 mass ppm or more and 60 mass ppm or less.
The antioxidant is, for example, at least one selected from the group consisting of 2,6-ditertiary butylphenol, 2,4-dimethyl-6-tertiary butylphenol, and 2,6-ditertiary butyl-4-methylphenol. It is.

  The oil composition of the present invention is required to satisfy both the composition and properties defined in the above (1) to (7), but the composition defined in the following (8) to (15) It is preferable that at least one of the properties is satisfied. Further, the oil composition of the present invention may further satisfy any of the compositions and properties defined in the following (8) to (15).

(8) Reaction test The oil composition of the present invention is the result of a petroleum product reaction test according to JIS K 2252 from the viewpoint of preventing corrosion of auxiliary equipment such as fuel oil tanks, piping, diesel engines and equipped pumps. It is preferably neutral.

(9) Water content The water content in the oil composition of the present invention is preferably 0.01% by volume or less with respect to the total volume of the oil composition of the present invention from the viewpoint of preventing filter blockage due to freezing. .
The water content in the oil composition of the present invention can be measured according to JIS K 2275 (crude oil and petroleum products—moisture test method).

(10) Ash content The amount of ash in the oil composition of the present invention is 0.001 with respect to the total mass of the oil composition of the present invention, from the viewpoint of suppressing burner tip wear and reducing the environmental burden due to exhaust gas. It is preferable that it is below mass%.
The ash content in the oil composition of the present invention can be measured according to JIS K 2272 (crude oil and petroleum product ash content and sulfate ash content test method).

(11) Residual carbon content of 10% residual oil The residual carbon content of the 10% residual oil in the oil composition of the present invention is the present invention from the viewpoint of maintaining the combustibility of the oil composition, particularly suppressing the occurrence of soot due to poor combustion. It is preferable that it is 0.01 mass% or less with respect to the oil composition total mass of.
The residual carbon content of the 10% residual oil can be measured according to JIS K 2270 (crude oil and petroleum products—residual carbon content test method).

(12) Kinematic viscosity The kinematic viscosity of the oil composition of the present invention is 1.30 mm ² / s or more at 30 ° C. from the viewpoint of adapting the oil composition to the specification range of the pump and the flow meter and ensuring combustibility. It is preferable that it is 1.70 mm < ² > / s or less.
The kinematic viscosity can be measured according to JIS K 2283 (crude viscosity and petroleum product kinematic viscosity test method).

(13) Composition With respect to the total volume of the oil composition of the present invention, the saturated content in the oil composition of the present invention is 75.0% by volume or more, the olefin content is 0.3% by volume or less, The group content is 25.0% by volume or less, the bicyclic aromatic content is preferably 3.0% or less, the tricyclic aromatic content is preferably 0.3% by volume or less, and the saturation content is 80.0%. More than volume%, olefin content is 0.1 volume% or less, 1-ring aromatic content is 20.0 volume% or less, 2-ring aromatic content is 1.0% or less, 3-ring aromatic The group content is more preferably 0.1% by volume or less.
The above composition of the oil composition of the present invention can be measured according to JPI-5S-49-2007 Petroleum products-Hydrocarbon type test method-High performance liquid chromatograph method.

[Other additives]
In the oil composition of the present invention, a low temperature fluidity improver, a lubricity improver, a cetane number improver, a combustion accelerator, a detergent, and a sludge dispersant are added to the oil composition of the present invention as long as the above properties can be maintained. Various additives such as a fungicide can be appropriately selected and blended. Moreover, you may mix | blend coumarin from a viewpoint of light oil collection tax.

[Examples of combustors that can suitably use the oil composition of the present invention]
The oil composition of the present invention has excellent combustion stability in addition to storage stability, low temperature fluidity, and oxidation stability. Therefore, the rated combustion amount is 10.0 L / hour or less and the spray hydraulic pressure is 0.90 MPa or less, preferably Is equipped with a hydraulic spray burner with a rated combustion amount of 7.0 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 characteristics of the oil composition of the present invention are particularly exhibited in external combustion machines such as steam boilers, hot water boilers, hot air heaters, absorption cold / hot water machines, and hot water generators.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not restrict | limited at all by these examples. In addition, the property of each base material was calculated | required according to the following method as above-mentioned.

[Evaluation of properties and composition of substrate]
(1) Density: Measured according to JIS K 2249.
(2) Kinematic viscosity (50 ° C.): Measured according to JIS K 2283.
(3) Sulfur content: measured in accordance with JIS K2541.
(4) Flash point: Measured according to JIS K 2265.
(5) Cloud point: Measured according to JIS K 2269.
(6) Distillation property: Measured according to JIS K 2254.
(7) Composition analysis: Measured according to JPI-5S-49-2007.
(8) Reaction test: Measured according to JIS K2252.
(9) Water content: measured in accordance with JIS K 2275.
(10) Ash content: Measured according to JIS K 2272.
(11) Residual carbon content of 10% residual oil: measured in accordance with JIS K 2270.

[Production method of substrate]
Four types of straight-run fractions with different boiling ranges obtained by atmospheric distillation of crude oil were hydrodesulfurized at a reaction temperature (about 340 ° C.) at which the sulfur content was 5 ppm by mass. Obtained. The base material 4 corresponds to kerosene.

[Evaluation of properties and composition of oil composition]
The properties and composition of the oil composition part were measured in the same manner as in the evaluation of the base material.

[Production of Oil Compositions of Examples 1 and 2, Comparative Examples 1 and 2 and Reference Example 1]
The base materials 1 to 4 having the properties and compositions shown in Table 1 below are mixed in the proportions shown in Table 2, and the oil compositions of Examples 1 and 2, Comparative Examples 1 and 2 and Reference Example 1 having the properties shown in Table 2 are mixed. Was made. The oil composition of Reference Example 1 corresponds to kerosene.
About each obtained oil composition, combustibility, storage stability, and low temperature fluidity | liquidity were evaluated on the following reference | standard. The results are shown in Table 2.

[Performance Evaluation Criteria]
1. Combustibility (1) Evaluation model, condition / evaluation model; Houseponk HK-1527 made by Nepon Co., Ltd. (rated combustion amount 4.9L / hour, on / off control)
Fuel spray pressure: 0.69 MPa (hydraulic spray burner)
・ Band shutter opening: Adjust exhaust gas oxygen concentration to 4.0 ± 0.2% ・ Fueler pre-burner heater: Off (2) Evaluation item Repeat 1 hour continuous combustion, 15 minutes fire extinguishing as 1 cycle The following items were evaluated after burning for 500 hours.
・ Ignition: No visual ignition delay ・ Flammability: Baccarat smoke smoke tester measures soot concentration (baccarat smoke number: SN) in exhaust gas (3) Evaluation criteria ・ No ignition delay, soot concentration (SN ) Is 1.0 or less;
・ Other than above; ×

2. Storage Stability (1) Evaluation Items After performing dark storage at 43 ° C. for 6 weeks (equivalent to storage for about 6 months at room temperature) in accordance with ASTM D4625, the peroxide value (JPI-5S-71) is determined. It was measured.
(2) Evaluation criteria / Peroxide value is less than 1 ppm;
・ Other than above; ×

3. Low temperature fluidity (1) Evaluation item The oil penetration limit temperature was measured in accordance with the standard for the low temperature fluidity test method (actual machine simulation method) of A heavy oil of JPI-5S-47-96. The oil passage limit temperature is the lowest oil temperature at which filter clogging does not occur due to wax precipitated at low temperatures. When the oil temperature is lowered below the oil passage limit temperature, the possibility of filter clogging with wax becomes very high.
(2) Evaluation criteria / oil passage limit temperature ≦ −20.0 ° C .;
・ Other than above; ×

[Performance evaluation results]
As apparent from Table 2, the oil compositions of Examples 1 and 2 included in the oil composition of the present invention were all good in combustibility, storage stability and low-temperature fluidity. The oil composition of Comparative Example 1 was poor in storage stability because it did not contain an antioxidant. Since the oil composition of Comparative Example 2 had a high 95% distillation temperature and a high cloud point, the combustibility was poor and the low temperature fluidity was also poor. The oil composition of Reference Example 1 corresponds to kerosene. By comparing the results of Reference Example 1 and the results of Examples 1 and 2, it was found that the oil compositions of Examples 1 and 2 were superior in storage stability to kerosene. In addition, the 95 ° C. distillation temperature of the oil composition of Reference Example 1 is 268.5 ° C., which is from the 95 ° C. distillation temperatures (279.0 ° C. and 284.5 ° C.) of the oil compositions of Examples 1 and 2. Therefore, the yield of the oil compositions of Examples 1 and 2 was found to be higher than that of kerosene.

  The fuel oil composition for an external combustor of the present invention is superior in storage stability and has a higher yield to crude oil than conventional kerosene, and therefore the fuel oil composition for an external combustor of the present invention is used as a fuel for an external combustor. By using it as an oil, it is possible to eliminate the shortage of kerosene and kerosene fractions that are in great demand in winter in cold regions.

Claims (5)

A fuel oil composition for an external combustor that satisfies all of the following (1) to (7).
(1) The content of a fraction obtained by hydrodesulfurizing a straight fraction obtained by an atmospheric distillation unit of crude oil is 90% by volume or more with respect to the total volume of the fuel oil composition for the external combustor. (2) Initial distillation (3) 95% distillation temperature is 271.0 ° C or higher and 300.0 ° C or lower (4) Flash point is 45.0 ° C or higher (5) Sulfur content is for the above external combustor 3 mass ppm or more and 10 mass ppm or less with respect to the total mass of the fuel oil composition (6) Cloud point is −20 ° C. or less (7) The amount of addition of the antioxidant is based on the total mass of the fuel oil composition for the external combustion machine 20 mass ppm or more and 100 mass ppm or less   The antioxidant is at least one selected from the group consisting of 2,6-ditertiary butylphenol, 2,4-dimethyl-6-tertiary butylphenol, and 2,6-ditertiary butyl-4-methylphenol. The fuel oil composition for an external combustor according to claim 1. The fuel oil composition for an external combustor according to claim 1 or 2, which satisfies at least one of the following (8) to (13).
(8) The result of the petroleum product reaction test according to JIS K 2252 is neutral. (9) The moisture content is 0.01% by volume or less with respect to the total volume of the fuel oil composition for an external combustor. The residual carbon content of 0.001% by mass or less (11) 10% residual oil with respect to the total mass of the fuel oil composition for an external combustion machine is 0.001% with respect to the total mass of the fuel oil composition for an external combustion engine. 01% by mass or less (12) Kinematic viscosity at 30 ° C. of 1.30 mm ² / s or more and 1.70 mm ² / s or less (13) With respect to the total volume of the fuel oil composition for the external combustion machine, The saturated content in the fuel oil composition is 75.0% by volume or more, the olefin content is 0.3% by volume or less, the 1-ring aromatic content is 25.0% by volume or less, the 2-ring aromatic content is 3.0% or less, Less than 0.3% by volume of 3-ring aromatics The fuel oil composition for an external combustor according to claim 1 or 2, wherein any of the following (8) to (13) is satisfied.
(8) The result of the petroleum product reaction test according to JIS K 2252 is neutral. (9) The moisture content is 0.01% by volume or less with respect to the total volume of the fuel oil composition for an external combustor. The residual carbon content of 0.001% by mass or less (11) 10% residual oil with respect to the total mass of the fuel oil composition for an external combustion machine is 0.001% with respect to the total mass of the fuel oil composition for an external combustion engine. 01% by mass or less (12) Kinematic viscosity at 30 ° C. of 1.30 mm ² / s or more and 1.70 mm ² / s or less (13) With respect to the total volume of the fuel oil composition for the external combustion machine, The saturated content in the fuel oil composition is 75.0% by volume or more, the olefin content is 0.3% by volume or less, the 1-ring aromatic content is 25.0% by volume or less, the 2-ring aromatic content is 3.0% or less, Less than 0.3% by volume of 3-ring aromatics   The external combustor according to any one of claims 1 to 4, for use in an external combustor equipped with a hydraulic spray burner having a rated combustion amount of 10.0 L / hour or less and a spray hydraulic pressure of 0.90 MPa or less. Fuel oil composition.