JP5111049B2 - High calorific value fuel oil composition - Google Patents

Description

  The present invention relates to a high calorific value fuel oil composition, in particular, a high calorific value fuel oil that can be used for external combustion equipment applications such as boilers, gas turbines, and industrial furnaces, and for diesel engine applications such as private power generation and fishing boats. It relates to a composition.

  In recent years, from the viewpoint of global warming and national energy security, reducing the amount of fossil fuel used has been a challenge, and fuel efficiency improvement has been strongly demanded, and various research and development have been continued. Currently, in Japan, A heavy oil is widely used not only for external combustion equipment such as boilers, gas turbines, and industrial furnaces, but also for diesel engines such as private power generation and fishing boats. Heavy oil (high calorie A heavy oil) has been energetically studied.

  For example, Patent Document 1 (Japanese Patent Laid-Open No. 2001-055587) describes an invention that aims to provide a fuel oil that is high in calories and has a small rubber swelling property and that is suitable for various combustion devices. It is described that the aniline point can be increased without lowering the total calorific value of the fuel oil by blending the directly degassed light oil, light desulfurized light oil or desulfurized dewaxed light oil with the cracked light oil. Specifically, the kinematic viscosity at 50 ° C. is 20 cSt or less, the sulfur content is 0.3 wt% or less, the flash point is 60 ° C. or more, the aniline point is 40 ° C. or more, and the total calorific value is 9,400 kcal / A fuel oil that is greater than or equal to L is described. Further, for example, in the example of Patent Document 1, as such fuel oil, kinematic viscosity 2.9 cSt, sulfur content 0.04 wt%, total calorific value 9,550 kcal / L, residual carbon 0.22%, cetane index 41 The fuel oil is described.

Patent Document 2 (Japanese Patent Application Laid-Open No. 2001-098287) has a problem that if the sulfur content is adjusted to a desired level of 0.1 wt% or less, the fuel becomes low density and low calorific value. An invention of a fuel oil produced using a heavy gas oil fraction obtained by direct desulfurization of heavy oil and having a sulfur content of 0.1 wt% or less and a density of 0.8762 g / cm ³ or more for the purpose of solving the problem Is described. Further, for example, in an example of Patent Document 2, a fuel oil having a density of 0.8892 g / cm ³ , a sulfur content of 0.06 wt%, a cetane index of 41, and a calorific value of 9,480 kcal / L is described.

  Furthermore, Patent Document 3 (Japanese Patent Application Laid-Open No. 2000-239675) adjusts the total amount of aromas of two rings and three or more rings to adjust the total amount of heat and is suitable for boilers. An invention relating to an A heavy oil composition which is environmentally friendly and can be used for an internal combustion engine by having a cetane index of a specific value or more is described. Specifically, the total aromatic content is 15 to 50% by volume, the total content of 2-ring aromatics and 3 or more aromatics is 4 to 13% by volume, and the sulfur content is 0.03% by mass or less. And an ultra-low sulfur A fuel oil composition characterized in that the residual carbon content of 10% residual oil exceeds 0.2% by mass and further has a cetane index of 40 or more.

JP 2001-055587 A JP 2001-098287 A JP 2000-239675 A

In Japan, heavy fuel oil A or heavy fuel oil C has been used as fuel for boilers, but high-calorie heavy fuel oil A has been widely used in house warmers and the like in order to reduce fuel costs and CO ₂ . The high-calorie A heavy oil generally has a higher calorific value than the general-purpose A heavy oil and has contributed to the improvement of fuel efficiency, but has a drawback that it cannot be used for diesel engines because of its poor ignitability.

  On the other hand, general-purpose A heavy oil has been used in diesel engines, but it has a high sulfur content, a large environmental load, a low calorific value, a poor fuel economy, a large amount of residual carbon, and filter clogging occurs. There were problems such as being easy.

In recent years, from the viewpoint of CO ₂ reduction, improvement in fuel efficiency of fishing boats and private power generation diesel engines is particularly desired. As mentioned above, high-calorie A heavy oil is used for diesel engines because of its poor ignitability. Can not.

  Accordingly, the object of the present invention is to provide a fuel oil composition that can be used for diesel engine applications, is high in calories, has a low sulfur content as an environmentally hazardous substance, and has a sufficiently low residual carbon content that causes filter clogging. There is to do.

  As a result of intensive research to solve the above-mentioned problems, the present inventors have obtained specific densities such as desulfurized light oil, low wax heavy gas oil, cracked gas oil, light high flash point high calorific value hydrocarbons, distillation properties, etc. It has been found that a fuel oil composition satisfying the desired properties can be obtained by blending the petroleum-based hydrocarbon having the present invention, and the present invention has been completed.

That is, the high calorific value fuel oil composition of the present invention is
Density is 0.89 g / cm ³ or more 0.91 g / cm ³ or less,
・ Sulfur content is 0.3 mass% or less,
・ Cetane index is 45 or more,
・ The flash point is 70 ℃ or higher.
-Residual carbon content of 10% residual oil is 0.03 mass% or less,
・ Pour point is -10 ℃ or less,
The wear scar diameter in the HFRR test is 460 μm or less,
-Total calorific value is 39,500 kJ / L or more-CCAI is 840 or less,
-Sodium content is 0.1 mass ppm or less,
-The calcium content is 0.1 mass ppm or less,
-Potassium content is 0.1 mass ppm or less,
-The vanadium content is 0.1 mass ppm or less and
-Mercury content is 0.1 mass ppm or less .

The high calorific value fuel oil composition of the present invention comprises 40 to 70% by volume of low wax heavy gas oil, 15 to 35% by volume of cracked gas oil, 30% by volume or less of desulfurized gas oil, and light high flash point high calorific value carbonization. It is preferable to blend 30% by volume or less of hydrogen.

  The high calorific value fuel oil composition of the present invention preferably has a cetane index of 50 or more.

  Furthermore, the high calorific value fuel oil composition of the present invention preferably has a total calorific value of 40,000 kJ / L or more.

  The high calorific value fuel oil composition of the present invention contains 1% by mass to 5% by mass of a fatty acid lower alcohol ester, has a triglyceride content of 0.01% by mass or less, and has a lower alcohol content of 0.01% by mass. In the following, the acid value is 0.13 mgKOH / g or less, the content of organic acids (the sum of formic acid, acetic acid and propionic acid) is 0.003 mass% or less and the oxidation stability is 0.12 mgKOH / g or less. The high calorific value fuel oil composition can be produced, for example, by blending 1 to 5% by volume of biodiesel together with the petroleum-based hydrocarbon.

In addition, the various parameters used in this specification refer to those measured according to the following method.
Density: Method specified at JIS K 2249 “Crude oil and petroleum product density test method” (15 ° C.)
Sulfur content: Method defined in JIS K 2541-6 “Sulfur content test method (ultraviolet fluorescence method)” Cetane index: Method defined in JIS K 2204-1992 “Petroleum products—Diesel oil” Flash point: JIS K 2265 3 Method stipulated in “How to obtain flash point” Residual carbon content of 10% residual oil: Method stipulated in JIS K 2270 “Test method for residual carbon content” Pour point: JIS K 2269 “Flow of crude oil and petroleum products” Point and petroleum product cloud point test method "wear scar diameter in HFRR test: method specified in JPI-5S-50-98" light oil-lubricity test method "Total calorific value: JIS K 2279" Method stipulated in “Method of testing calorific value” CCAI: Method stipulated in ISO 8217 “Specification of Marine Fuels”

Fatty acid lower alcohol ester content (fatty acid methyl ester content): Liquid chromatography method Triglyceride content: Liquid chromatography method Lower alcohol content (methanol content): Oxygen detection gas chromatography method Acid value: JIS K 2501 Method specified in “Japanese test method” Organic acid content: Water extraction ion chromatography

  Oxidation stability: In the oxidation stability test of ISO 12205, the sample temperature was changed from 95 ° C. to 115 ° C., and oxygen was supplied to 350 mL of the sample at a supply amount of 3 L / h and a supply pressure of 98 kPa for 16 hours. An oxidation test is performed in which the sample is cooled to ice and returned to room temperature. The value obtained by subtracting the acid value before the test from the acid value after the oxidation test is defined as oxidation stability.

Sodium content, calcium content, potassium content, vanadium content: Plasma emission spectroscopy Mercury content: Atomic absorption method Kinematic viscosity: JIS K 2283 “Kinematic viscosity test method for crude oil and petroleum products, and petroleum product clay index calculation method "
Distillation properties: Method specified in JIS K 2254 “Fuel oil distillation test method”

  According to the present invention, the diesel engine has good ignitability, has all of high calorie, low sulfur, and low residual carbon content. It becomes possible to provide a fuel oil composition suitable for engine applications.

The present invention is described in detail below. Fuel oil compositions of the present invention, density of 0.89 g / cm ³ or more 0.91 g / cm ³ or less, a sulfur content of 0.3 wt% or less, in cetane index of 45 or more, a flash point of 70 ° C. The residual carbon content of 10% residual oil is 0.03 mass% or less, the pour point is −10 ° C. or less, the wear scar diameter in the HFRR test is 460 μm or less, and the total calorific value is 39,500 kJ / L. The CCAI is 840 or less, the sodium content is 0.1 mass ppm or less, the calcium content is 0.1 mass ppm or less, the potassium content is 0.1 mass ppm or less, and the vanadium content is 0. 0.1 mass ppm or less and mercury content is 0.1 mass ppm or less . The fuel oil composition of the present invention has a high total calorific value, low sulfur content, low residual carbon content of 10% residual oil, high cetane index, and CCAI (Calculated Carbon Aromaticity Index) which is an index of ignitability. ) Is relatively low, it can be suitably used as a fuel for external combustion engines such as boilers, heaters for agricultural houses and industrial furnaces, as well as for ships such as fishing boats and diesel engines for private power generation.

The fuel oil composition of the present invention has a density of 0.89 to 0.91 g / cm ³ . When the density of the fuel oil composition is less than 0.89 g / cm ³ , a fuel oil composition having a high total calorific value may not be obtained.

  The fuel oil composition of the present invention preferably has a 5% distillation temperature of 190 to 250 ° C, more preferably 200 to 235 ° C. If it is lower than 190 ° C., the flash point may be lowered. If it exceeds 250 ° C., the ignitability may deteriorate.

  The fuel oil composition of the present invention preferably has a 95% distillation temperature of 380 to 430 ° C, more preferably 400 to 420 ° C. When the temperature is lower than 380 ° C., a sufficient calorific value may not be obtained. When it exceeds 430 degreeC, low-temperature fluidity | liquidity and ignitability may deteriorate.

  The fuel oil composition of the present invention has a total calorific value of 39,500 kJ / L or more, preferably 40,000 kJ / L or more. Since the fuel oil composition of the present invention has a high calorific value, the fuel efficiency is improved and the burden on the environment is reduced. As a high-calorie fuel oil composition, external combustion such as a house warmer, boiler, industrial furnace, etc. It can be suitably used for equipment applications and diesel engine applications such as private power generation and fishing boats.

  The fuel oil composition of the present invention has a sulfur content of 0.3% by mass or less, preferably 0.2% by mass or less. The smaller the sulfur content in the fuel oil composition, the smaller the amount of sulfur oxide emitted, and the better the fuel. If the sulfur content exceeds 0.3% by mass, corrosion of combustion equipment and flues may become a problem in external combustion engine applications, and deterioration of exhaust gas treatment catalysts and the like becomes a problem in diesel engine applications. There is a case.

  The fuel oil composition of the present invention has a wear scar diameter of 460 μm or less, preferably 400 μm or less, in an HFRR (High Frequency Reciprocating Rig) test. In general, a fuel oil with a low sulfur content tends to have a low lubricity, and as described above, the fuel oil composition of the present invention has a sulfur content of 0.3% by mass or less. Since the fuel oil composition has a wear scar diameter of 460 μm or less in the HFRR test, the fuel oil composition has good lubricity for a pump of a fuel supply system.

  The fuel oil composition of the present invention has a cetane index of 45 or more and a CCAI of 840 or less. In general, a fuel oil having a high density and a large total calorific value tends to have a low cetane index due to its high aromatic content and low paraffin content. However, the fuel oil composition of the present invention has a high cetane index. Since CCAI is low (that is, there is little ignition delay), the ignitability is good, and it can be suitably used for marine vessels such as fishing boats and diesel engine applications such as private power generation. The cetane index is preferably 47 or more, more preferably 50 or more. The CCAI is preferably 837 or less, and more preferably 835 or less.

  The fuel oil composition of the present invention has a pour point of −10 ° C. or lower, preferably −12.5 ° C. or lower, more preferably −15.0 ° C. or lower. Since the fuel oil composition of the present invention has a low pour point, it has good low-temperature characteristics, and can be suitably used for house warmers, boilers, and diesel engines even when the outside air temperature decreases such as in winter.

  In the fuel oil composition of the present invention, the residual carbon content of 10% residual oil is 0.03 mass% or less, preferably 0.02 mass% or less, and more preferably 0.01 mass% or less. Since the fuel oil composition of the present invention has a low residual carbon content of 10% residual oil, the problem of clogging of the fuel filter is reduced or suppressed, and deposits on a cylinder or nozzle of a diesel engine are also reduced or suppressed. .

  Furthermore, the fuel oil composition of the present invention has a flash point of 70 ° C. or higher, preferably 73 ° C. or higher, more preferably 75 ° C. or higher. Since the fuel oil composition of the present invention has a high flash point, it also has an advantage of being easy to handle.

In addition, the fuel oil composition of the present invention, sodium content, calcium content, potassium content, vanadium content and mercury content requires that as the metal element is not more than 0.1 mass ppm, respectively. When these metal contents are 0.1% by mass or less, wear in an engine, a gas turbine, or the like can be prevented.

  The method for producing the fuel oil composition of the present invention is not particularly limited. Examples of the base material to be blended with the fuel oil composition of the present invention include desulfurized gas oil, low wax heavy gas oil, cracked gas oil, light high flammability. Point high calorific value hydrocarbons and biodiesel can be preferably used, and these are preferably combined in an appropriate combination.

<Desulfurized diesel oil>
Examples of the base material used for blending the fuel oil composition of the present invention include desulfurized light oil. The desulfurized gas oil is a fraction obtained by hydrorefining a straight-run gas oil fraction. Here, the hydrorefining of the straight-run gas oil fraction may be performed under general hydrorefining conditions. As a desulfurized gas oil fraction suitable as a base material of the fuel oil composition according to the present invention, for example, a 5% distillation temperature is 200 to 250 ° C., a 95% distillation temperature is 340 to 380 ° C., and a sulfur content is 10 mass. Examples include a fraction of ppm or less. Since the desulfurized gas oil has a low sulfur content, it serves to lower the sulfur content of the fuel oil composition. In addition, it is preferable that the compounding quantity of the desulfurized light oil in the fuel oil composition of this invention shall be 30 volume% or less.

<Low wax heavy gas oil>
As a base material used for blending the fuel oil composition of the present invention, a low wax heavy fuel oil is preferable. The low-wax heavy gas oil is a hydrodesulfurization of a heavy gas oil fraction having a 5% distillation temperature of 300 to 330 ° C and a 95% distillation temperature of 390 to 460 ° C distilled from an atmospheric distillation apparatus. Then, it is a fraction obtained by decomposing and removing the wax with a dewaxing device, for example, a fraction having a 5% distillation temperature of 250 to 310 ° C and a 95% distillation temperature of 400 to 430 ° C. . Low wax heavy gas oil is a fraction having a relatively high density and a high total calorific value, and serves to increase the calorific value of the fuel oil composition. Can be used. In addition, it is preferable that the usage-amount of the low wax heavy fuel oil in the fuel oil composition of this invention shall be 40-70 volume% normally, Furthermore, 50-60 volume%.

<Decomposed light oil>
As the base material to be blended in the fuel oil composition of the present invention, cracked light oil is also preferable. The cracked light oil is a fraction distilled from a fluid catalytic cracker, and examples thereof include a fraction having a 5% distillation temperature of 200 to 250 ° C and a 95% distillation temperature of 340 to 380 ° C. . The cracked gas oil has a high aromatic content, a high density, a high calorific fraction, and a relatively low pour point, so that the total calorific value of the fuel oil composition is raised and the pour point is lowered. Since it plays a role, it can be suitably used for blending the fuel oil composition of the present invention. In addition, it is preferable that the usage-amount of the cracked light oil in the fuel oil composition of this invention shall be 15-35 volume% normally, Furthermore, 20-30 volume%.

<Light, high flash point, high calorific value hydrocarbon>
Examples of the base material to be blended with the fuel oil composition of the present invention include light high flash point high calorific value hydrocarbon fraction. The light high flash point high calorific value hydrocarbon is a raffinate fraction obtained as a residue from a normal paraffin production apparatus, having a 5% distillation temperature of 180 to 210 ° C and a 95% distillation temperature of 220 to 260 ° C. Refers to the fraction that is Since the light high flash point high calorific value hydrocarbon is a fraction having a low sulfur content, a high flash point, and an extremely low pour point, the light high flash point high calorific value hydrocarbon fraction is used as the fuel oil composition of the present invention. By blending into the fuel oil composition, the sulfur content of the fuel oil composition can be lowered and the pour point can be lowered. In addition, the usage-amount of the light high flash point high calorific value hydrocarbon fraction in the fuel oil composition of this invention is 30 volume% or less normally, Furthermore, 20 volume% or less is preferable. In addition, it is preferable that the total compounding quantity of this light high flash point high calorific value hydrocarbon and the above-mentioned desulfurized light oil shall be 15 volume% or more.

<Biodiesel>
You may mix | blend biodiesel with the fuel oil composition of this invention. In the present invention, biodiesel refers to a fatty acid lower alcohol ester produced by chemical treatment using biological oils such as vegetable oils, animal oils and fish oils as raw materials. In the present invention, the fatty acid lower alcohol ester refers to a fatty acid esterified using a linear or branched alcohol having 1 to 4 carbon atoms, for example, fatty acid methyl ester, fatty acid ethyl ester. , Fatty acid propyl ester, fatty acid butyl ester or mixtures thereof. In view of oxidation stability and yield, the fatty acid lower alcohol ester is preferably a fatty acid methyl ester, a fatty acid ethyl ester or a mixture thereof, and particularly preferably a fatty acid methyl ester. Since one of the fuel oil compositions according to the present invention is produced by blending biodiesel, when using biodiesel produced from oil derived from vegetable oil, carbon dioxide reduction, that is, as a measure against global warming It is valid. Moreover, there exists a merit which improves lubricity by adding biodiesel.

  Examples of the vegetable oil include, but are not limited to, corn oil, soybean oil, olive oil, rapeseed oil, sesame oil, peanut oil, jatropha oil, and palm oil. The animal oil is not particularly limited, and examples thereof include liver oil, whale oil, beef tallow, beef dairy fat, horse oil, pork oil, and sheep fat. In addition, the fish oil is not particularly limited, and examples thereof include shark oil, shark oil, shark oil, squid oil, and saury oil.

  Such esterified fats and oils can be produced using any means known to those skilled in the art, for example, by reacting the fats and oils with lower alcohols such as methanol and ethanol in the presence of acid or alkali, It can be produced by a purification method.

  When biodiesel is blended in the fuel oil composition of the present invention, the blending amount of the biodiesel is preferably 1.0% by mass or more in total with respect to the total amount of the fuel oil composition. However, since biodiesel tends to deteriorate in quality and may cause clogging of a filter due to the generation of sludge, the fuel oil composition is used when biodiesel is blended with the fuel oil composition according to the present invention. It is preferable that the total content is at most 5.0% by mass, especially the fatty acid methyl ester is 5.0% by mass or less.

  The triglyceride content in the fuel oil composition is preferably 0.01% by mass or less, and the lower alcohol content corresponding to the fatty acid lower alcohol ester is preferably 0.01% by mass or less. In order to maintain the oxidative stability of the fuel oil composition, it is necessary that the triglyceride content is 0.01% by mass or less and the lower alcohol content is 0.01% by mass or less.

  The fuel oil composition of the present invention preferably has an acid value of 0.13 mg KOH / g or less and an organic acid (total of formic acid, acetic acid and propionic acid) content of 0.003 mass% or less. The oxidation stability of the composition is preferably 0.12 mgKOH / g or less. This can be achieved by adding an antioxidant to the fatty acid lower alcohol ester.

  Furthermore, the fuel oil composition of the present invention may further contain one or more fuel oil additives known in the art as needed. Although these compounding quantities can be selected suitably, in order to suppress an engine deposit production | generation, it is preferable to maintain the total compounding quantity of an additive to 0.1 mass% or less normally. Examples of fuel oil additives that can be used in the fuel oil composition of the present invention include ethylene-vinyl acetate copolymer, ethylene-alkyl acrylate copolymer, polymer system such as polyalkyl acrylate, alkenyl succinic acid amide, etc. Surfactant-type low-temperature fluidity improvers, alkyl nitrate cetane number improvers, fatty acid-based and ester-based lubricity improvers, and the like.

  The present invention will be described in detail below based on examples, but the present invention is not limited thereto.

  The hydrocarbon-based fuel oil base materials shown in Table 1 were prepared and blended in the proportions shown in Table 2 to prepare fuel oil compositions of Examples 1 to 4. For comparison, a commercially available heavy oil A (Comparative Example 1), a commercially available light oil (Comparative Example 2), and a commercially available high calorie A heavy oil (Comparative Example 3) were prepared. Properties of the fuel oil compositions of these examples and comparative examples are shown in Tables 2 and 3. Each substrate was prepared by the following method.

  Desulfurized gas oil (base material A): a fraction having a 5% distillation temperature of 227 ° C and a 95% distillation temperature of 349 ° C obtained by hydrorefining straight-run gas oil distilled from an atmospheric distillation apparatus .

  Low wax heavy gas oil (base B): 5% distillation temperature obtained by catalytic dewaxing after straightening heavy gas oil distilled from an atmospheric distillation apparatus is 280 ° C, 95 The fraction with a% distillation temperature of 421 ° C.

  Cracked light oil (base material C): a fraction having a 5% distillation temperature of 224 ° C and a 95% distillation temperature of 365 ° C distilled from a fluid catalytic cracking apparatus.

  Light high flash point high calorific value hydrocarbon (base material D): Among the raffinate obtained as a residue from a normal paraffin production apparatus, a fraction having a 5% distillation temperature of 195 ° C and a 95% distillation temperature of 241 ° C is there.

  Biodiesel (Substrate E): Fatty acid methyl ester obtained by transesterification of palm oil with methanol, a fraction having a 5% distillation temperature of 327 ° C and a 95% distillation temperature of 350 ° C.

  From Table 2, the fuel oil compositions of the examples according to the present invention have high density and a large total calorific value, so that they are effective in improving fuel efficiency, and since the cetane index is high and CCAI is low, the ignitability is excellent. In addition, the residual carbon content of 10% residual oil is low, so it is difficult to clog the fuel filter. Furthermore, since the HFRR wear scar is small, the lubricity is good, and the pour point is low, so the low temperature characteristics are good. In addition, since the sulfur content is small, it can be seen that the emission amount of sulfur oxide can be reduced.

  On the other hand, from Table 3, commercially available heavy oil A (Comparative Example 1) has a low density and a low calorific value, so it cannot improve fuel consumption and has a high sulfur content, thus increasing the amount of sulfur oxide emissions. In addition, because the residual carbon content of 10% residual oil is high, it is easy to clog the fuel filter, and because the cetane index is low, the ignitability is poor and it is not suitable as a fuel for diesel engines, and the pour point is Since it is high, it turns out that low-temperature characteristics are bad.

  Moreover, it turns out that a commercially available light oil (comparative example 2) cannot improve a fuel consumption, since a density is low and the emitted-heat amount is low.

  Furthermore, the commercially available high-calorie A heavy oil (Comparative Example 3) has a high residual carbon content of 10% residual oil, so it is easy to clog the fuel filter, and the low cetane index results in poor ignitability. In addition to being unsuitable as a fuel, the pour point is high, indicating that the low temperature characteristics are poor.

Claims (5)

Density of 0.89 g / cm ³ or more 0.91 g / cm ³ or less, a sulfur content of 0.3 wt% or less, with at cetane index of 45 or more, a flash point of 70 ° C. or more, the residual 10% residual oil Carbon content is 0.03% by mass or less, pour point is −10 ° C. or less, wear scar diameter in HFRR test is 460 μm or less, total calorific value is 39,500 kJ / L or more, and CCAI is 840 or less ,
Sodium content is 0.1 mass ppm or less, calcium content is 0.1 mass ppm or less, potassium content is 0.1 mass ppm or less, vanadium content is 0.1 mass ppm or less, and mercury is contained. A high calorific value fuel oil composition characterized by having an amount of 0.1 mass ppm or less . 40% to 70% by volume of low wax heavy gas oil, 15 to 35% by volume of cracked gas oil, 30% by volume or less of desulfurized gas oil, and 30% by volume or less of light high flash point high calorific value hydrocarbon Item 4. The high calorific value fuel oil composition according to Item 1.   The high calorific value fuel oil composition according to claim 1 or 2, wherein the cetane index is 50 or more.   The high calorific value fuel oil composition according to any one of claims 1 to 3, wherein the total calorific value is 40,000 kJ / L or more.   1% to 5% by weight of a fatty acid lower alcohol ester, a triglyceride content of 0.01% by weight or less, a lower alcohol content of 0.01% by weight or less, and an acid value of 0.13 mg KOH / g or less, The high heat generation according to any one of claims 1 to 4, wherein the content of the organic acid (the sum of formic acid, acetic acid and propionic acid) is 0.003 mass% or less and the oxidation stability is 0.12 mgKOH / g or less. Quantity fuel oil composition.