JP6536954B2 - Fuel oil composition for external combustion machine - Google Patents

Description

  The present invention relates to a fuel oil composition for an external combustion machine used for an external combustion machine such as a boiler or a warm air heater, and more specifically, it has a high yield, is excellent in storage stability and combustion, and is cold The present invention relates to a fuel oil composition for an external combustion machine, which is excellent in low temperature fluidity even in the cold season of the earth.

Kerosene (JIS K 2203), A heavy oil (JIS K 2205 Class 1 heavy oil) and C heavy oil (JIS K 2205) are mainly used as fuel oil compositions for boilers, warm air heaters, and external furnaces such as industrial furnaces. Heavy oil) is used.
Kerosene is a fuel oil composition having extremely low contents of sulfur, nitrogen and residual carbon, small environmental impact from combustion, and excellent low temperature fluidity. In addition, kerosene is excellent in combustibility also in an external combustion machine equipped with a hydraulic spray type burner having a small rated combustion amount and a low spray hydraulic pressure. However, in cold winters, kerosene demand such as room heating is high, and special consideration is required for stable supply.
A heavy oil generally has excellent supply stability, and has the advantage of having a high calorific value compared to kerosene. However, in heavy oil seasons of A heavy oil, in order to prevent filter clogging due to the deposition of wax, it may be necessary to take measures such as equipment response in the cold season. Further, when used in an external combustion machine equipped with a hydraulic spray type burner having a small rated combustion amount and a low spray hydraulic pressure, it is necessary to improve the flammability.
C heavy oil has a higher calorific value than A heavy oil. However, because of the high viscosity, handling is inconvenient, for example, requiring heating equipment at the time of use. In addition, C heavy oil can not be used for an external combustion machine equipped with a hydraulic spray type burner having a low rated combustion amount and a low spray hydraulic pressure, since the fuel oil has low combustibility. Furthermore, C heavy oil has the disadvantages of high sulfur content, nitrogen content and residual carbon content, and a high environmental impact.
In order to contribute to the stable supply of the fuel oil composition for external combustion engines in winter, the present inventors have shown excellent stability in long-term storage so far, and are excellent also in cold regions of extremely cold season A fuel oil composition for an external combustion machine which exhibits excellent flammability even in an external combustion machine equipped with a hydraulic spray type burner which exhibits low temperature fluidity, low rated combustion amount and low spray oil pressure, and which is obtained at a high yield Have been proposed (see Patent Documents 1 and 2).

JP 2004-182744 A JP 2004-182745 A

However, it is desirable to further improve the yield of the fuel oil composition for external combustion and further stabilize the supply of the fuel oil composition for external combustion.
Therefore, the present invention exhibits excellent stability in long-term storage, exhibits excellent low-temperature fluidity even in a cold region during extremely cold season, has a low rated combustion amount, and is equipped with a hydraulic spray type burner with low spray hydraulic pressure. An object of the present invention is to provide a fuel oil composition for an external combustion machine which exhibits excellent flammability also in a combustion machine and is obtained at a high yield.

MEANS TO SOLVE THE PROBLEM As a result of earnest examination in view of the said subject, the present inventors discovered that the fuel oil composition for external combustion machines which has specific composition and properties can solve the said subject.
The present invention is as follows.
[1] A fuel oil composition for an external combustion unit which satisfies all of the following (1) to (7).
(1) The content of the hydrodesulfurized fraction of a straight fraction obtained by an atmospheric distillation apparatus for crude oil is 90% by volume or more based on the total volume of the fuel oil composition for an external combustion machine (2) initial distillation 140.0 ° C or more (3) 95% distillation temperature is 271.0 ° C or more and 300.0 ° C or less (4) Flash point is 45.0 ° C or more (5) Sulfur content ratio is for the external combustion machine 3 mass ppm or more and 10 mass ppm or less based on the total mass of the fuel oil composition (6) cloud point of -20 ° C. or less (7) the amount of antioxidant added relative to the total mass of the external fuel oil composition 20 mass ppm or more and 100 mass ppm or less [2] The antioxidant is 2,6-di-tert-butylphenol, 2,4-dimethyl-6-tert-butyl-phenol, and 2,6-di-tert-butyl-4-methylphenol At least one selected from the group consisting of The fuel oil composition for external combustion machines as described in [1].
[3] The fuel oil composition for external combustion engines as described in 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 shows that the neutral (9) moisture content is not more than 0.01% by volume (10) ash content with respect to the total volume of the fuel oil composition for an external combustion machine And 0.001% by mass or less based on the total mass of the fuel oil composition for an external combustor (11) 10% residual carbon content of the residual oil is 0. 0 to the total mass of the fuel oil composition for an external combustor. 01% by mass or less (12) Dynamic viscosity is 1.30 mm ² / s or more and 1.70 mm ² / s or less at 30 ° C. (13) For the external combustion machine relative to the total volume of the fuel oil composition for the external combustion machine 75.0% by volume or more of saturated content in fuel oil composition, 0.3% by volume or less of olefin content, 25.0% by volume or less of 1 ring aromatic content, 3.0% or less of 2 ring aromatic content, Tricyclic aromatic content is 0.3% by volume or less [4] The above [1] or [2] satisfying any 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 shows that the neutral (9) moisture content is not more than 0.01% by volume (10) ash content with respect to the total volume of the fuel oil composition for an external combustion machine And 0.001% by mass or less based on the total mass of the fuel oil composition for an external combustor (11) 10% residual carbon content of the residual oil is 0. 0 to the total mass of the fuel oil composition for an external combustor. 01% by mass or less (12) Dynamic viscosity is 1.30 mm ² / s or more and 1.70 mm ² / s or less at 30 ° C. (13) For the external combustion machine relative to the total volume of the fuel oil composition for the external combustion machine 75.0% by volume or more of saturated content in fuel oil composition, 0.3% by volume or less of olefin content, 25.0% by volume or less of 1 ring aromatic content, 3.0% or less of 2 ring aromatic content, Tricyclic aromatic content is 0.3 vol% or less [5] rated combustion amount is 10.0 L / hr or less and 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 exhibits excellent stability in long-term storage, exhibits excellent low-temperature fluidity even in a cold region during extremely cold season, and has a low rated combustion amount and a low spray hydraulic pressure. It is possible to provide a fuel oil composition for an external combustion machine which exhibits excellent flammability also in a combustion machine and is obtained at a high yield.
In addition, the good combustibility, the excellent storage stability and the excellent low temperature fluidity of the fuel oil composition for external combustion according to the present invention contribute to the stable supply of kerosene fractions which are in high 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 external combustion (hereinafter sometimes referred to as "the oil composition of the present invention") which satisfies all of the compositions and properties defined in the following (1) to (7).
The oil composition of the present invention (1) The content of the hydrodesulfurized fraction of a straight fraction obtained by an atmospheric distillation apparatus for crude oil is 90% by volume based on the total volume of the external fuel oil composition (2) Initial boiling point is 140.0 ° C or higher (3) 95% distillation temperature is 271.0 ° C to 300.0 ° C (4) Flash point is 45.0 ° C or higher (5) Sulfur content 3 to 10 ppm by mass with respect to the total mass of the fuel oil composition for an external combustion machine (6) cloud point of -20 ° C. or less (7) antioxidant oil added amount of the fuel oil composition for an external combustion machine 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 machine]
(Properties and composition of fuel oil composition for external combustion)
The fuel oil composition for external combustion engines 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 a fraction obtained by hydrodesulfurizing a straight fraction obtained by an atmospheric distillation apparatus for crude oil A hydrodesulfurization of a straight distillate fraction obtained by an atmospheric distillation apparatus for crude oil in the oil composition of the present invention The content of the fraction obtained 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 combustion engine of the present invention is higher than the 95% distillation temperature (270 ° C. or less) 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 to crude oil of the straight fraction is higher than the yield to kerosene of crude oil. Therefore, by setting the content of the hydrodesulfurized fraction of a straight distillate having a high yield compared to kerosene to 90% by volume or more as described above, the yield of the oil composition of the present invention can be reduced to kerosene. It can be made relatively high.

The 95% (95% by volume) distillation temperature of the straight fraction obtained by the atmospheric distillation apparatus for crude oil is 271 ° C. or more and 300.0 ° C. or less, preferably 273 ° C., from the viewpoint of securing the yield. It is 290.degree. C. or less, more preferably 275.degree. C. to 285.degree. C., further preferably 276.degree. C. to 285.degree. C., still more preferably 277.degree. C. to 285.degree. C., still more preferably 278.degree. C. or less, more preferably 279 ° C. or more and 285 ° C. or less.
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 distillate fraction are, for example, as follows.
Reaction temperature: 250 ° C. or more and 390 ° C. or less, preferably 300 ° C. or more and 350 ° C. or less Hydrogen partial pressure: 1.0 MPa or more and 10.0 MPa or less, preferably 2.0 MPa or more and 5.0 MPa or less 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 can further contain the following fractions 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 (directly-run gas oil fraction) obtained by atmospheric distillation of crude oil with an atmospheric distillation apparatus (ii) Obtained by atmospheric distillation of a crude oil with an atmospheric distillation apparatus Fraction obtained by hydrocracking the light oil fraction (vacuum gas oil fraction) obtained by vacuum distillation of the remaining residual fraction (atmospheric distillation residue oil) with a vacuum distillation apparatus (iii) atmospheric distillation residual oil and / or vacuum A distillate obtained by fluid catalytic cracking of a residue fraction obtained by direct desulfurization of a distillation residue oil, and a fraction obtained by hydrocracking a gas oil fraction (decomposed gas oil) (iv) Atmospheric distillation residue oil and / or vacuum distillation residue oil Fraction obtained by direct desulfurization treatment of crude oil with a direct desulfurization apparatus (directly-degassed petroleum oil fraction) fraction obtained by hydrocracking (v) isoparaffinic solvent produced in a petrochemical plant, aromatic series Among solvents, the sulfur content is 100 ppm or less and the boiling range is 140.0 ° C. or higher 3 Fraction below 20.0 ° C

(2) Initial boiling point The initial boiling point of the oil composition of the present invention is 140.0 ° C. or higher, preferably 145.0 ° C. or higher, from the viewpoint of ensuring safety in handling, and securing the yield Preferably it is 160 degrees C or less from a viewpoint of, and more preferably 145.0 degrees C or more and 160 degrees C or less.
The above-mentioned 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 more and 300.0 ° C. or less from the viewpoint of securing the yield and maintaining the combustibility. Preferably 273 ° C. or more and 290 ° C. or less, more preferably 275 ° C. or more and 285 ° C. or less, more preferably 276 ° C. or more and 285 ° C. or less, more preferably 277 ° C. or more and 285 ° C. or less Preferably it is 278 degreeC or more and 285 degreeC or less, More preferably, it is 279 degreeC or more and 285 degreeC or less. In particular, since the 95% distillation temperature in the oil composition of the present invention is higher than the 95% distillation temperature (270 ° C. or less) in kerosene, the yield of the oil composition of the present invention to the feedstock is the feedstock of kerosene Higher than oil yield.
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 the present invention is 45.0 ° C. or higher from the viewpoint of ensuring safety in handling.
The above-mentioned 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 maintains storage stability, and from the viewpoint of reducing the environmental load due to sulfur oxides in exhaust gas, the entire oil composition of the present invention The concentration is 3 to 10 mass ppm, preferably 4 to 8 mass ppm with respect to the mass.
The above-mentioned sulfur content can be measured according to JIS K 2541 (Crude oil and petroleum products-Sulfur content test method-).

(6) Cloud point The cloud point in the oil composition of the present invention secures low temperature fluidity even in the cold season of cold regions, and prevents clogging of the filter by the deposited wax without making facilities correspondence such as heat retention From the point of view of -20.degree.
The above-mentioned cloud point can be measured according to JIS K 2269 (Pour point of crude oil and petroleum products and test method of cloud point of petroleum products).

(7) Antioxidant Addition Amount The antioxidant addition amount in the oil composition of the present invention is relative to the total mass of the oil composition from the viewpoint of maintenance of storage stability, securing of combustibility and reduction of additive cost, 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 all of the compositions and properties defined in the above (1) to (7), but the compositions further defined in the following (8) to (15) It is preferable to satisfy at least one of the properties. In addition, the oil composition of the present invention may further satisfy all of the compositions and properties defined by the following (8) to (15).

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

(9) Water Content Rate The water content rate in the oil composition of the present invention is preferably 0.01% by volume or less based on the total volume of the oil composition of the present invention from the viewpoint of preventing filter clogging due to icing. .
The water content in the oil composition of the present invention can be measured in accordance with JIS K 2275 (Crude oil and petroleum products-Moisture test method-).

(10) Amount of Ash 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 the wear of the burner tip and reducing the environmental load by the exhaust gas. It is preferable that it is mass% or less.
The ash content in the oil composition of the present invention can be measured according to JIS K 2272 (Test method for ash and sulfate ash content of crude oil and petroleum products).

(11) Residual carbon content of 10% residual oil The residual carbon content of 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 defective combustion. It is preferable that it is 0.01 mass% or less with respect to the total mass of the oil composition of above.
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 matching the oil composition to the specification range of the pump and flow meter and securing the combustibility. It is preferable that it is 1.70 mm < ² > / s or less.
The above-mentioned dynamic viscosity can be measured according to JIS K 2283 (Kinematic viscosity test method for crude oil and petroleum products).

(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 volume% or more, and the olefin content is 0.3 volume% or less. The content of the aromatic ring is preferably 25.0% by volume or less, the content of the two-ring aromatics is not more than 3.0%, the content of the three-ring aromatics is preferably 0.3% by volume or less, and the saturated content is 80.0 Vol% or more, olefin content is 0.1 vol% or less, 1 ring aromatic content is 20.0 vol% 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-mentioned composition of the oil composition of the present invention can be measured according to JPI-5S-49-2007 Petroleum product-hydrocarbon type test method-high performance liquid chromatography.

[Other additives]
In the oil composition of the present invention, a low-temperature fluidity improver, a lubricity improver, a cetane improver, a combustion promoter, a detergent, a sludge dispersant, as needed, as long as the above-mentioned various properties can be maintained. And various additives such as antifungal agents can be appropriately selected and blended. In addition, coumarin may be blended from the viewpoint of the light oil takeover tax.

[Example of combustion machine that can suitably use the oil composition of the present invention]
The oil composition of the present invention is excellent in storage stability, low temperature fluidity, oxidation stability and also in flammability, so the rated combustion amount is 10.0 L / hour or less and the spray hydraulic pressure is 0.90 MPa or less, preferably Mounted a hydraulic spray type 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 boilers such as steam boilers, hot water boilers, warm air heaters, absorption chillers and warmers, and hot water generators.

  EXAMPLES The present invention will next be described in more detail by way of examples, which should not be construed as limiting the invention thereto. In addition, the property of each base material was calculated | required according to the following method as mentioned above.

[Evaluation of properties and composition of base material]
(1) Density: Measured in accordance with JIS K 2249.
(2) Dynamic viscosity (50 ° C.): Measured in accordance with JIS K 2283.
(3) Sulfur content: Measured in accordance with JIS K 2541.
(4) Flash point: Measured in accordance with JIS K 2265.
(5) Cloud point: Measured in accordance with JIS K 2269.
(6) Distillation properties: Measured according to JIS K 2254.
(7) Composition analysis: Measured in accordance with JPI-5S-49-2007.
(8) Reaction test: Measured in accordance with JIS K 2252.
(9) Water content rate: Measured in accordance with JIS K 2275.
(10) Ash content: Measured in accordance with JIS K 2272.
(11) Residual carbon content of 10% residual oil: Measured according to JIS K 2270.

[Method of producing base material]
Four kinds of straight distillates with different boiling point ranges obtained by atmospheric distillation of crude oil are each hydrodesulfurized at a reaction temperature (about 340 ° C.) at which sulfur content becomes 5 mass ppm, and base materials 1 to 4 are obtained Obtained. The base 4 corresponds to kerosene.

[Evaluation of Properties and Composition of Oil Composition]
The properties and composition of the oil composition part were determined in the same manner as in the above evaluation of the substrate.

[Production of Oil Composition of Examples 1 and 2, Comparative Examples 1 and 2 and Reference Example 1]
The base compositions 1 to 4 having the properties and compositions shown in Table 1 below are mixed at a ratio shown in Table 2 and the oil compositions of Examples 1 and 2 and Comparative Examples 1 and 2 and Reference Example 1 of the properties shown in Table 2 Was produced. The oil composition of Reference Example 1 corresponds to kerosene.
The flammability, storage stability and low temperature fluidity of each oil composition obtained were evaluated based on the following criteria. The results are shown in Table 2.

[Evaluation criteria for performance]
1. Flammability (1) Evaluation model, condition and evaluation model; Nepon House KAONKI HK-1527 (rated combustion amount 4.9 L / hour, on-off control)
· Fuel spray pressure: 0.69MPa (hydraulic spray type burner)
・ Band shutter opening degree; Adjust exhaust gas oxygen concentration to 4.0 ± 0.2% ・ Burner before heater for fuel heating; OFF (2) Evaluation items 1 hour continuous combustion, fire extinction for 15 minutes is repeated as 1 cycle After burning for 500 hours, the following items were evaluated.
・ Ignition property: No visual delay in ignition ・ Flammability; Measure soot concentration (buccar smoke number; SN) in exhaust gas with a buccal smoke tester (3) Evaluation criteria ・ There is no ignition delay, soot concentration (SN Is less than 1.0; ○
・ Other than the above; x

2. Storage stability (1) Evaluation items After storage in the dark at 43 ° C. for 6 weeks (corresponding to storage for approximately 6 months at room temperature) according to ASTM D4625, the peroxide value (JPI-5S-71) It was measured.
(2) Evaluation criteria: The peroxide value is less than 1 ppm; ○
・ Other than the above; x

3. Low temperature fluidity (1) Evaluation item The oil passage limit temperature was measured according to JPI-5S-47-96, based on the low temperature fluidity test method standard (real machine simulation method) of A fuel oil. The oil passage limit temperature is the minimum oil temperature at which filter clogging does not occur due to the wax deposited at low temperature. If the oil temperature is lowered below the oil passage limit temperature, the possibility of wax filter clogging becomes very high.
(2) Evaluation criteria · limit temperature of oil passing −2-20.0 ° C; ○
・ Other than the above; x

[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 flammability, storage stability and low temperature fluidity. The oil composition of Comparative Example 1 had poor storage stability because it did not contain an antioxidant. The oil composition of Comparative Example 2 had a high 95% distillation temperature and a high cloud point, so the flammability 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 with the results of Examples 1 and 2, it was found that the oil compositions of Examples 1 and 2 are 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., and the 95 ° C. distillation temperature (279.0 ° C. and 284.5 ° C.) of the oil compositions of Examples 1 and 2 Also, it was found that the yield of the oil composition of Examples 1 and 2 was higher than the yield of kerosene because the oil composition was low.

  The fuel oil composition for an external combustion machine of the present invention is superior in storage stability to conventional kerosene and has a high yield to crude oil, so the fuel oil composition for an external combustion machine of the present invention is used as a fuel for an external combustion machine. By using it as an oil, it is possible to eliminate the short supply of kerosene and kerosene fractions, which are in high demand in winter in cold regions.

Claims (5)

A fuel oil composition for an external burner which satisfies all of the following (1) to (7).
(1) The content of the hydrodesulfurized fraction of a straight fraction obtained by an atmospheric distillation apparatus for crude oil is 90% by volume or more based on the total volume of the fuel oil composition for an external combustion machine (2) initial distillation 140.0 ° C or more (3) 95% distillation temperature is 271.0 ° C or more and 300.0 ° C or less (4) Flash point is 45.0 ° C or more (5) Sulfur content ratio is for the external combustion machine 3 mass ppm or more and 10 mass ppm or less based on the total mass of the fuel oil composition (6) cloud point of -20 ° C. or less (7) the amount of antioxidant added relative to the total mass of the external fuel oil composition 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-ditert-butylphenol, 2,4-dimethyl-6-tert-butylphenol, and 2,6-di-tert-butyl-4-methylphenol A fuel oil composition for an external combustor according to claim 1. The fuel oil composition for external combustion engines 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 shows that the neutral (9) moisture content is not more than 0.01% by volume (10) ash content with respect to the total volume of the fuel oil composition for an external combustion machine And 0.001% by mass or less based on the total mass of the fuel oil composition for an external combustor (11) 10% residual carbon content of the residual oil is 0. 0 to the total mass of the fuel oil composition for an external combustor. 01% by mass or less (12) Dynamic viscosity is 1.30 mm ² / s or more and 1.70 mm ² / s or less at 30 ° C. (13) For the external combustion machine relative to the total volume of the fuel oil composition for the external combustion machine 75.0% by volume or more of saturated content in fuel oil composition, 0.3% by volume or less of olefin content, 25.0% by volume or less of 1 ring aromatic content, 3.0% or less of 2 ring aromatic content, Tricyclic aromatic content is 0.3% by volume or less The fuel oil composition for external combustion engines according to claim 1 or 2, wherein all of the following (8) to (13) are satisfied.
(8) The result of the petroleum product reaction test according to JIS K 2252 shows that the neutral (9) moisture content is not more than 0.01% by volume (10) ash content with respect to the total volume of the fuel oil composition for an external combustion machine And 0.001% by mass or less based on the total mass of the fuel oil composition for an external combustor (11) 10% residual carbon content of the residual oil is 0. 0 to the total mass of the fuel oil composition for an external combustor. 01% by mass or less (12) Dynamic viscosity is 1.30 mm ² / s or more and 1.70 mm ² / s or less at 30 ° C. (13) For the external combustion machine relative to the total volume of the fuel oil composition for the external combustion machine 75.0% by volume or more of saturated content in fuel oil composition, 0.3% by volume or less of olefin content, 25.0% by volume or less of 1 ring aromatic content, 3.0% or less of 2 ring aromatic content, Tricyclic aromatic content is 0.3% by volume or less   The external combustion machine according to any one of claims 1 to 4 for use in an external combustion machine equipped with a hydraulic spray type burner having a rated combustion amount of 10.0 L / hr or less and a spray hydraulic pressure of 0.90 MPa or less. Fuel oil composition.