CN117625262A - Special diesel oil for heavy diesel engine and preparation method thereof - Google Patents
Special diesel oil for heavy diesel engine and preparation method thereof Download PDFInfo
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- CN117625262A CN117625262A CN202410057023.XA CN202410057023A CN117625262A CN 117625262 A CN117625262 A CN 117625262A CN 202410057023 A CN202410057023 A CN 202410057023A CN 117625262 A CN117625262 A CN 117625262A
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- 239000002283 diesel fuel Substances 0.000 title claims abstract description 171
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 238000004821 distillation Methods 0.000 claims abstract description 84
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims abstract description 36
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims abstract description 34
- 239000012188 paraffin wax Substances 0.000 claims abstract description 33
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 claims abstract description 27
- 238000009835 boiling Methods 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 16
- 239000003245 coal Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 239000000446 fuel Substances 0.000 abstract description 13
- 229930195733 hydrocarbon Natural products 0.000 description 24
- 150000002430 hydrocarbons Chemical class 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 18
- 239000003921 oil Substances 0.000 description 17
- 238000002485 combustion reaction Methods 0.000 description 14
- 230000008901 benefit Effects 0.000 description 12
- 239000004215 Carbon black (E152) Substances 0.000 description 9
- 239000000295 fuel oil Substances 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000013329 compounding Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- -1 HC compounds Chemical class 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002199 base oil Substances 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Abstract
The invention provides diesel oil special for a heavy diesel engine and a preparation method thereof, and belongs to the technical field of fuels, wherein the diesel oil special for the heavy diesel engine provided by the invention comprises the following components in percentage by volume, 100% in total: 85-95% of light diesel oil and 5-15% of indirect liquefied coal-made diesel oil, wherein the initial distillation point of special diesel oil is 175-178 ℃ and the density is 820-826 kg/cm 3 The total aromatic hydrocarbon content is 14-17% m/m, the polycyclic aromatic hydrocarbon content is 2.5-2.8% m/m, the cetane number is 51-56, and the paraffin content is 41-51% m/m.
Description
Technical Field
The disclosure belongs to the technical field of fuels, and particularly relates to a special low-emission fuel for a heavy diesel engine and a preparation method thereof.
Background
The proposal of the dual-carbon target and the increasingly strict emission requirements put forward higher requirements on the exhaust emission of the engine, and the reduction of the exhaust emission of the engine becomes a problem to be solved urgently in the field of engines. The physicochemical properties of diesel oil have important influence on the combustion and emission of diesel oil, the physicochemical properties of diesel oil are influenced by hydrocarbon components in fuel, meanwhile, the carbon/hydrogen (C/H) ratio, benzene ring structure and the like of hydrocarbon components also have direct influence on the emission, the load of heavy vehicles is large, the tail gas emission condition generated by using the current diesel oil is worse than that of light vehicles, therefore, under the increasingly strict emission requirements, the hydrocarbon components of diesel oil need to be compounded again to realize clean combustion, wherein the hydrocarbon components of diesel oil used by the heavy diesel engine are more urgent to be compounded, so that the emission reduction problem of the heavy vehicles is scheduled.
Disclosure of Invention
In view of the above, an object of the present disclosure is to provide a diesel oil special for a heavy duty diesel engine and a preparation method thereof, so as to at least partially solve the above technical problems, and make the physicochemical properties of the fuel of the reconstituted diesel oil meet the requirements of GB19147-2016 "diesel oil for vehicle" standard on the basis of better and stable properties of the reconstituted diesel oil special for the heavy duty diesel engine, so as to reduce emissions of Particulate Matters (PM) and Hydrocarbons (HC) in the tail gas, and reduce atmospheric pollution.
In this regard, the specific technical scheme provided in the present disclosure is as follows:
according to one aspect of the present disclosure, there is provided a heavy duty diesel engine dedicated diesel fuel, the dedicated diesel fuel totaling 100% by volume fraction, comprising the following components: 85-95% of light diesel oil and 5-15% of indirect liquefied coal-made diesel oil, wherein the initial distillation point of special diesel oil is 175-178 ℃ and the density is 820-826 kg/cm 3 The total aromatic hydrocarbon content is 14-17% m/m, the polycyclic aromatic hydrocarbon content is 2.5-2.8% m/m, the cetane number is 51-56, and the paraffin content is 41-51% m/m.
According to some embodiments of the present disclosure, the distillate range of heavy duty diesel engine specific diesel is 170-340 ℃.
According to some embodiments of the present disclosure, the dedicated diesel has a 50% distillation temperature of 250-253 ℃, a 90% distillation temperature of 316-318 ℃, and a 95% distillation temperature of 330-331 ℃.
According to some embodiments of the present disclosure, the light diesel has an initial boiling point of 178-183 ℃ and a density of 828-835 kg/cm 3 The total aromatic hydrocarbon content is 17-18% m/m, the polycyclic aromatic hydrocarbon content is 3-3.3% m/m, the cetane number is 49-51, and the paraffin content is 36-40% m/m; indirect liquidThe initial distillation point of the diesel oil produced by melting coal is 166-170 ℃, and the density is 770-780 kg/cm 3 The total aromatic hydrocarbon content is 2.7-3.3% m/m, the polycyclic aromatic hydrocarbon content is 1.7-2.3% m/m, the cetane number is 65-75, and the paraffin content is 75-85% m/m.
According to some embodiments of the present disclosure, the light diesel has a distillation range of 178-345 ℃ and the indirect liquefied coal-to-diesel has a distillation range of 166-350 ℃.
According to some embodiments of the present disclosure, the light diesel oil has a 50% distillation temperature of 248-250 ℃, a 90% distillation temperature of 312-316 ℃, and a 95% distillation temperature of 332-335 ℃; the indirect liquefied coal-to-diesel oil has 50% distilling temperature of 290-300 deg.c, 90% distilling temperature of 330-340 deg.c and 95% distilling temperature of 343-347 deg.c.
According to some embodiments of the present disclosure, the light diesel has an initial boiling point of 178.4 ℃ and a density of 828.5kg/cm 3 The total aromatic hydrocarbon content was 17.9% m/m, the polycyclic aromatic hydrocarbon content was 3.0% m/m, the cetane number was 49.2, the paraffin content was 38.9% m/m, the 50% distillation temperature was 249.4 ℃, the 90% distillation temperature was 315.7 ℃, and the 95% distillation temperature was 332.5 ℃.
According to some embodiments of the present disclosure, the indirect liquefaction of coal-to-diesel oil has an initial boiling point of 168.9 ℃ and a density of 774.9kg/cm 3 The total aromatic hydrocarbon content is 3%m/m, the polycyclic aromatic hydrocarbon content is 2%m/m, the cetane number is 71.2, the paraffin content is 80% m/m, the 50% distillation temperature is 293.3 ℃, the 90% distillation temperature is 337 ℃, and the 95% distillation temperature is 346.6 ℃.
According to another aspect of the present disclosure, a method of preparing a heavy duty diesel engine specific diesel fuel, comprises: and sequentially introducing the light diesel oil and the indirect liquefied coal diesel oil into blending equipment, and mixing and circulating to obtain the special diesel oil for the heavy diesel engine.
According to some embodiments of the present disclosure, the mixing cycle time is 4 to 6 hours.
Based on the technical scheme, the special diesel oil for the heavy diesel engine and the preparation method thereof have at least the following beneficial effects:
in the embodiment of the disclosure, the characteristics of higher cetane number, higher paraffin content, lower density, lower aromatic hydrocarbon content, lower initial boiling point and the like of the indirect liquefied coal-made diesel are utilized, the indirect liquefied coal-made diesel is mixed and compounded with the light diesel according to a proportion, so that the initial boiling point of the light diesel is reduced, the density is reduced, the total aromatic hydrocarbon content and the polycyclic aromatic hydrocarbon content are reduced, the cetane number and the paraffin content are improved, the compounded diesel can be fully combusted in the combustion process, the emission of particulate matters, hydrocarbons (HC, namely hydrocarbon substances) and the like in tail gas is reduced, and the atmospheric pollution is reduced; meanwhile, the pressure of the post-treatment system of the heavy diesel engine is relieved, the overall environmental protection benefit of the heavy diesel vehicle is obviously improved, and the method has wider application.
Detailed Description
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made in detail to the embodiments.
The light diesel oil has the advantages of higher cetane number, higher paraffin content, lower density, lower aromatic hydrocarbon content and lower initial boiling point when being directly used, but has higher cost, the problem of insufficient power when being directly used, and the engine part abrasion is caused by the poor lubricity of the indirect liquefied coal diesel oil when being directly used for an engine. In order to relieve the pressure of a post-treatment system of a heavy diesel engine and reduce the emission of Particulate Matters (PM) and Hydrocarbons (HC) in tail gas, the present disclosure proposes to utilize an indirect liquefied coal-based diesel oil with a higher cetane number, a higher paraffin content, a lower density, a lower aromatic hydrocarbon content and a lower initial boiling point compared with light diesel oil to blend with the light diesel oil, so as to obtain a special diesel oil for the heavy diesel engine, and the obtained special diesel oil phase has the characteristics of higher cetane number, higher paraffin content, lower aromatic hydrocarbon content, lower density and lower initial boiling point compared with the light diesel oil, and has more sufficient power and higher economic benefit and environmental benefit compared with the indirect liquefied coal-based diesel oil.
In the embodiment of the disclosure, the light diesel oil is an oil refining processing technology and a coal-to-oil technology product, and the market is easy to obtain; to meet the requirements of the present disclosure, the following description and specification are made for light diesel oil: the light diesel oil used in the present disclosure is not limited to manufacturers, and only the specification of the light diesel oil process source and related indexes is basically described. The light diesel oil used in the present disclosure is a commercial-20 # vehicular diesel oil, which satisfies the gas station commercial oil product of GB19147-2016 "vehicular diesel oil" standard, and is easy to obtain.
For the distillate quality standard: the distillation range is an important index for ensuring the rapid gasification and combustion of diesel oil in a combustion chamber of an engine, and the diesel oil with higher distillation range temperature has poor evaporation property, is easy to cause incomplete combustion and easy to generate carbon deposition and smoke dust, so that the service performance of the diesel oil is poor, and the diesel oil is mainly characterized in the aspects of difficult low-temperature starting, poor oil atomization, insufficient combustion and the like, thereby influencing the service life and reliability of the engine; the diesel oil with lower distillation range temperature has better evaporability, can ensure complete combustion, reduces carbon deposition and smoke dust, improves the service performance of the diesel oil, and mainly has the advantages of smooth low-temperature start, good oil atomization, complete combustion and the like. Thus, lowering the boiling range temperature, especially the initial boiling point, can improve the mixing process of diesel and air and thereby reduce diesel emissions. The whole distillation range of the diesel oil comprises several indexes such as an initial distillation point, a 10% distillation temperature (T10), a 50% distillation temperature (T50), a 90% distillation temperature (T90), a 95% distillation temperature (T95), a final distillation point and a residual quantity, and the indexes represent the temperature of each section of the fraction of a certain volume of diesel oil in the heating distillation process. For example, a 50% distillation temperature is the temperature at which 50% of the diesel is distilled off by volume.
The density can directly influence the oil injection time and the oil injection rule of the diesel engine, and can also obviously influence the broken particle size, the spray penetration distance, the spray cone angle and the like of the fuel spray, so that the in-cylinder combustion process of the engine and pollutant emission are influenced, the density is reduced, the emission is reduced, and the fuel economy is lost. Aromatic hydrocarbons have important roles in improving the cetane number of diesel oil and reducing the generation of smoke, however, aromatic hydrocarbons and polycyclic aromatic hydrocarbons are incompletely combusted in a diesel engine due to high carbon content, NOx and HC (hydrocarbon) are easy to generate, particulate matters are promoted to be generated, sediment in a combustion chamber is increased, and the emission pollution of the engine is increased. The cetane number is an important quality index for representing the spontaneous ignition capability of diesel oil, and represents the combustion speed and completeness of the diesel oil in an engine, the higher the cetane number is, the shorter the flame-retarding period of the diesel oil is, the better the ignition performance is, the higher the power and fuel economy of the engine are, and the rough operation of the engine is effectively avoided. Paraffins have a faster flame propagation speed and a higher H/C (hydrogen/carbon) ratio, and therefore have better combustion performance and produce lower emissions.
Specifically, the special diesel oil for the heavy diesel engine provided by the disclosure comprises the following components in percentage by volume: 85-95% of light diesel oil and 5-15% of indirect liquefied coal-made diesel oil, wherein the initial distillation point of special diesel oil is 175-178 ℃ and the density is 820-826 kg/cm 3 The total aromatic hydrocarbon content is 14-17% m/m, the polycyclic aromatic hydrocarbon content is 2.5-2.8% m/m, the cetane number is 51-56, and the paraffin content is 41-51% m/m.
In the embodiment of the disclosure, the characteristics of higher cetane number, higher paraffin content, lower density, lower aromatic hydrocarbon content, lower initial boiling point and the like of the indirect liquefied coal-made diesel oil are utilized, and the indirect liquefied coal-made diesel oil is mixed and compounded with the light diesel oil according to a proportion so as to reduce the initial boiling point of the light diesel oil, reduce the density, reduce the total aromatic hydrocarbon content and the polycyclic aromatic hydrocarbon content, improve the cetane number and the paraffin content, thereby fully burning the compounded diesel oil in the burning process, reducing the emission of particulate matters, HC compounds and the like in tail gas and reducing the atmospheric pollution; meanwhile, the pressure of the post-treatment system of the heavy diesel engine is relieved, the overall environmental protection benefit of the heavy diesel vehicle can be obviously improved, and the method has wider application.
According to some embodiments of the present disclosure, the heavy duty diesel engine is a diesel engine with a load of greater than 3.5 tons.
According to some embodiments of the present disclosure, the initial boiling point refers to the temperature at which the diesel fuel begins to boil, and a lower initial boiling point of the diesel fuel indicates that the components are more light, and reducing the initial boiling point can improve the mixing process of the diesel fuel and air, thereby reducing the emission of the diesel engine.
According to some embodiments of the present disclosure, a commercially available light diesel fuel for a # 20 vehicle is used, which has a higher initial boiling point, a higher density, and a lower cetane number, paraffin content, resulting in a more particulate and hydrocarbon emissions of the vehicle diesel fuel during use, wherein the light diesel fuel has an initial boiling point of 178-183 ℃ and a density of 828-835 kg/cm 3 The total aromatic hydrocarbon content is 17-18% m/m, the polycyclic aromatic hydrocarbon content is 3-3.3% m/m, the cetane number is 49-51, the paraffin content is 36-40% m/m, and the distillation range of the light diesel oil is 178-345 ℃. Specifically, the 50% distillation temperature of the light diesel oil is 248-250 ℃, the 90% distillation temperature is 312-316 ℃, and the 95% distillation temperature is 332-335 ℃. The indirect liquefied coal-made diesel oil has the characteristics of higher cetane number, lower density, higher paraffin content, lower aromatic hydrocarbon content and lower initial distillation point, but has higher production cost and poorer lubricity compared with the light diesel oil product for the commercial-20 # vehicle, wherein the initial distillation point of the indirect liquefied coal-made diesel oil is 166-170 ℃ and the density is 770-780 kg/cm 3 The total aromatic hydrocarbon content is 2.7-3.3% m/m, the polycyclic aromatic hydrocarbon content is 1.7-2.3% m/m, the cetane number is 65-75, the paraffin content is 75-85% m/m, and the distillation range of the indirect liquefied coal-to-diesel oil is 166-350 ℃. Specifically, the indirect liquefied coal-made diesel oil has a 50% distillation temperature of 290-300 ℃, a 90% distillation temperature of 330-340 ℃, and a 95% distillation temperature of 343-347 ℃.
Further, the light diesel oil has an initial boiling point of 178.4 ℃ and a density of 828.5kg/cm 3 The total aromatic hydrocarbon content is 17.9% m/m, the polycyclic aromatic hydrocarbon content is 3.0% m/m, the cetane number is 49.2, the paraffin content is 38.9% m/m, the 50% distillation temperature is 249.4 ℃, the 90% distillation temperature is 315.7 ℃, and the 95% distillation temperature is 332.5 ℃; the initial distillation point of the indirect liquefied coal-to-diesel oil is 168.9 ℃ and the density is 774.9kg/cm 3 The total aromatic hydrocarbon content is 3%m/m, the polycyclic aromatic hydrocarbon content is 2%m/m, the cetane number is 71.2, the paraffin content is 80% m/m, the 50% distillation temperature is 293.3 ℃, the 90% distillation temperature is 337 ℃, and the 95% distillation temperature is 346.6 ℃.
In the embodiment of the disclosure, the production cost and respective advantages of two oil products are comprehensively considered, the method of mixing the two oil products is adopted, the respective advantages of the two oil products are fully utilized, and the special diesel oil with low emission of the heavy diesel engine is obtained. For example, the initial boiling point of the indirect liquefied coal-made diesel is lower (such as 168.9 ℃), and the initial boiling point of the diesel special for the heavy diesel is lower than that of the light diesel (commercial-20 # vehicle diesel) after the indirect liquefied coal-made diesel is mixed with 5-15% of the volume fraction, so that the emission is improved. The density of the indirect liquefied coal-made diesel is lower, the density of the special diesel for the heavy diesel is reduced compared with that of the light diesel after the indirect liquefied coal-made diesel with the volume fraction of 5-15% is mixed, the reduction of the density is beneficial to the reduction of emission, and meanwhile, the fuel economy loss is smaller due to the less mixing. The total aromatic hydrocarbon and polycyclic aromatic hydrocarbon content of the indirect liquefied coal-made diesel oil is lower, and the total aromatic hydrocarbon content and polycyclic aromatic hydrocarbon content of the special diesel oil for the heavy diesel engine are reduced compared with the light diesel oil after the indirect liquefied coal-made diesel oil is mixed with 5-15% of volume fraction, so that the emission is improved. The cetane number of the indirect liquefied coal-made diesel is higher, and the cetane number of the diesel special for the heavy diesel is improved compared with that of the light diesel (commercial-20 # diesel) after the indirect liquefied coal-made diesel is mixed with 5-15% of volume fraction, so that the emission is improved. Because the paraffin content of the indirect liquefied coal-made diesel oil is higher, the paraffin content of the special diesel oil for the heavy diesel engine is improved compared with that of the light diesel oil after the indirect liquefied coal-made diesel oil with the volume fraction of 5-15% is mixed, so that the emission is improved.
According to some embodiments of the present disclosure, the dedicated diesel has a 50% distillation temperature of 250-253 ℃, a 90% distillation temperature of 316-318 ℃, and a 95% distillation temperature of 330-331 ℃. Thus, the distillation range of the diesel oil special for the heavy diesel engine is 170-340 ℃. In the examples of the present disclosure, to ensure good cold start performance, there should be a portion of the light components (130-160 ℃) to ensure a lower initial point of distillation, but the final point of distillation should not exceed 340 ℃, otherwise, in high speed diesel engines, they cannot be vaporized and burned in time, causing coking of the combustion chamber and black smoke in the exhaust.
According to some embodiments of the present disclosure, the dedicated diesel is in volumeThe total of the fractions is 100 percent, and the fraction comprises the following components: 85-90% of light diesel oil and 10-15% of indirect liquefied coal-made diesel oil, wherein the initial distillation point of special diesel oil is 176-178 ℃ and the density is 820-823 kg/cm 3 The total aromatic hydrocarbon content is 15-16% m/m, the polycyclic aromatic hydrocarbon content is 2.5-2.7% m/m, the cetane number is 52-56, and the paraffin content is 47-51% m/m.
According to another aspect of the present disclosure, there is provided a method of preparing diesel fuel dedicated to a heavy duty diesel engine, comprising: and sequentially introducing the light diesel oil and the indirect liquefied coal diesel oil into blending equipment, and mixing and circulating to obtain the special diesel oil for the heavy diesel engine.
According to some embodiments of the present disclosure, the mixing cycle time is 4 to 6 hours.
In the embodiment of the disclosure, two oil products of diesel oil for a commercial-20 # vehicle and diesel oil for indirect liquefied coal are proportionally introduced into blending equipment for mechanical mixing, and the special diesel oil for a heavy diesel engine can be obtained. The preparation method of the special diesel oil provided by the disclosure is simple, has mild conditions, and is suitable for large-scale industrial production.
The technical solution of the present disclosure is further explained below with reference to a specific embodiment, and it should be noted that the specific embodiment is only for facilitating the better understanding of the technical solution of the present disclosure by those skilled in the art, and should not be taken as unreasonable limitation of the protection scope of the present disclosure.
In the following examples of the present disclosure, the raw materials used were all the same batch of raw materials. The special diesel for the heavy diesel engine provided by the disclosure is beneficial to relieving the pressure of a post-treatment system of the heavy diesel engine according to the specific raw materials selected according to the actual operation condition of the heavy diesel engine with the load of more than 3.5 tons. The initial distillation point of the commercial-20 # vehicular diesel oil adopted by the present disclosure is 178.4 ℃, and the density is 828.5kg/cm 3 The total aromatic hydrocarbon content was 17.9% m/m, the polycyclic aromatic hydrocarbon content was 3.0% m/m, the cetane number was 49.2, the paraffin content was 38.9% m/m, the 50% distillation temperature was 249.4 ℃, the 90% distillation temperature was 315.7 ℃, and the 95% distillation temperature was 332.5 ℃. The initial distillation point of the indirect liquefied coal-to-diesel oil is 168.9 ℃ and the density is 774.9kg/cm 3 Total aromatic hydrocarbon contentThe amount was 3%m/m, the polycyclic aromatic hydrocarbon content was 2%m/m, the cetane number was 71.2, the paraffin content was 80% m/m, the 50% distillation temperature was 293.3 ℃, the 90% distillation temperature was 337 ℃, and the 95% distillation temperature was 346.6 ℃.
Example 1
The special diesel oil compounding scheme for the heavy diesel engine is designed:
the commercial-20 # diesel oil (light diesel oil) for the vehicle and the indirect liquefied coal-made diesel oil were mixed, wherein the volume fraction of the light diesel oil was 95%, and the volume fraction of the indirect liquefied coal-made diesel oil was 5%, as shown in table 1.
The light diesel oil and the indirect liquefied coal diesel oil are sequentially introduced into a compound fuel oil tank through a pipeline, the compound fuel oil tank is started to carry out mixed circulation, and the special diesel oil for the heavy diesel engine is obtained after 4-6 hours.
Example 2
The special diesel oil compounding scheme for the heavy diesel engine is designed:
the commercial-20 # vehicular diesel (light diesel) and the indirect-liquefied coal-made diesel (10% of the indirect-liquefied coal-made diesel were mixed in the same manner as in example 1, wherein the light diesel was 90% and the indirect-liquefied coal-made diesel was 10% in terms of volume fraction, as shown in table 1.
The light diesel oil and the indirect liquefied coal diesel oil are sequentially introduced into a compound fuel oil tank through a pipeline, the compound fuel oil tank is started to carry out mixed circulation, and the special diesel oil for the heavy diesel engine is obtained after 4-6 hours.
Example 3
The special diesel oil compounding scheme for the heavy diesel engine is designed:
the commercial-20 # vehicular diesel (light diesel) and the indirect-liquefied coal-made diesel were mixed in the same manner as in example 1, wherein the light diesel was 85% and the indirect-liquefied coal-made diesel was 15% in terms of volume fraction, as shown in table 1.
The light diesel oil and the indirect liquefied coal diesel oil are sequentially introduced into a compound fuel oil tank through a pipeline, the compound fuel oil tank is started to carry out mixed circulation, and the special diesel oil for the heavy diesel engine is obtained after 4-6 hours.
Comparative example 1
Comparative fuel protocol was designed:
the commercial-20 # vehicular diesel oil (light diesel oil) was used, and the light diesel oil was 100% by volume, and is shown in table 1.
Comparative example 2
Comparative fuel protocol was designed:
the commercial-20 # diesel oil (light diesel oil) for vehicle was used, and the volume fraction thereof was 50% of the light diesel oil and 50% of the hydrocracked diesel oil, as shown in Table 1.
The light diesel oil and the hydrogenation catalytic cracking diesel oil are sequentially introduced into a compound fuel oil tank through a pipeline, the compound fuel oil tank is started to carry out mixed circulation, and after 4-6 hours, the fuel of comparative example 2 is obtained.
TABLE 1 Table of compounding schemes for examples 1-3 and comparative examples 1-2
| Base oil | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 |
| Light diesel oil | 95％ | 90％ | 85％ | 100％ | 50％ |
| Indirect liquefied coal-to-diesel oil | 5％ | 10％ | 15％ | 0％ | 0％ |
| Hydrocracked diesel | 0％ | 0％ | 0％ | 0％ | 50％ |
In order to relieve the pressure of a post-treatment system of a heavy diesel engine and reduce the emission of particulate matters and hydrocarbon in tail gas, the requirements of GB19147-2016 standard requirements of automotive diesel oil are met according to the physicochemical properties of oil fuels, and the requirements of the oil disclosed by the disclosure are designed: cetane number is 51-56, density is 820-826 kg/cm 3 The initial distillation point is 175-178 ℃, the paraffin content is 41-51% m/m, the polycyclic aromatic hydrocarbon content is 2.5-2.8% m/m, the total aromatic hydrocarbon content is 14-17% m/m, the 50% distillation temperature (T50) is 250-253 ℃, the 90% distillation temperature (T90) is 316-318 ℃, and the 95% distillation temperature (T95) is 330-331 ℃. Further, the technical schemes in the above examples and comparative examples were tested, and specific test results are shown in table 2.
TABLE 2 oil index for examples 1-3 and comparative examples 1-2
As can be seen from table 2, compared with the light diesel oil, the production cost of the hydrocracked diesel is higher, 50% of the hydrocracked diesel is added to 50% of the light diesel, the physicochemical properties of the hydrocracked diesel are similar to those of the light diesel, the adjustment effects on the cetane number, density, initial point, paraffin content, polycyclic aromatic hydrocarbon content and total aromatic hydrocarbon content of the light diesel are small, and the requirements of the disclosure are not satisfied. However, the requirements of the present disclosure can be met by only adding a small amount of indirect liquefied coal-to-diesel oil, and the economy is high. Therefore, the method comprehensively considers the production cost and respective advantages of the two oil products, adopts the method of mixing the two oil products, fully utilizes the respective advantages of the two oil products and obtains the special diesel oil for the heavy diesel engine.
Bench test:
the particulate matter and hydrocarbon emissions of the above examples were tested by bench test-off-road test cycle test, wherein the test was performed using a 6-cylinder 6.6L heavy duty diesel engine from national six emission regulations for VI engines, and the off-road test cycle test was performed, with specific bench test results shown in table 3.
TABLE 3 bench test results
| Performance index | PM，g/KW.h | HC，g/KW.h |
| Example 1 | 0.0379 | 0.2343 |
| Example 1 variation from comparative example 1 | -0.52％ | -4.79％ |
| Example 2 | 0.0227 | 0.1346 |
| Example 2 variation from comparative example 1 | -40.42％ | -45.31％ |
| Example 3 | 0.0221 | 0.2341 |
| Example 3 variation from comparative example 1 | -41.99％ | -4.88％ |
| Comparative example 1 | 0.0381 | 0.2461 |
| Comparative example 2 | 0.0286 | 0.2418 |
As can be seen from table 3, the PM and HC emissions of the diesel oil dedicated for the heavy duty diesel engine provided in examples 1 to 3 are significantly smaller than those of the fuel oil of comparative example 1 (i.e., -20# diesel oil commercially available), and the PM and HC emissions of the diesel oil dedicated for the heavy duty diesel engine provided in examples 1 to 3 satisfy the requirements of the present disclosure, so that the PM and HC emissions can be effectively improved, and the overall environmental protection benefits of the vehicle can be significantly improved. Comparative example 2 has a smaller PM and HC emission improvement effect than comparative example 1. Further, as can be seen from table 3, the improvement of PM and HC emissions of example 2 compared to the scheme of example 1 is evident, since example 2 has an increased cetane number, a decreased density, a decreased T90, an increased paraffin content, a decreased polycyclic aromatic hydrocarbon content, and a decreased total aromatic hydrocarbon content compared to example 1. The initial point, T90 and T95 of example 3 are increased, the PM emissions of example 3 are improved and the HC emissions are increased compared to the scheme of example 2. Therefore, the content of the indirect liquefied coal-made diesel oil is not as high as possible, the compounding scheme is 90% of the light diesel oil, and the effect obtained when the indirect liquefied coal-made diesel oil is 10% is better.
While the foregoing is directed to embodiments of the present disclosure, other and further details of the invention may be had by the present application, it is to be understood that the foregoing description is merely exemplary of the present disclosure and that no limitations are intended to the scope of the disclosure, except insofar as modifications, equivalents, improvements or modifications may be made without departing from the spirit and principles of the present disclosure.
Claims (10)
1. A heavy duty diesel engine dedicated diesel fuel characterized in that said dedicated diesel fuel amounts to 100% in volume fraction comprising the following components:
85% -95% of light diesel oil and 5% -15% of indirect liquefied coal diesel oil;
the initial distillation point of the special diesel oil is 175-178 ℃ and the density is 820-826 kg/cm 3 The total aromatic hydrocarbon content is 14-17% m/m, the polycyclic aromatic hydrocarbon content is 2.5-2.8% m/m, the cetane number is 51-56, and the paraffin content is 41-51% m/m.
2. The heavy duty diesel engine specific diesel fuel according to claim 1, characterized in that the distillation range of the heavy duty diesel engine specific diesel fuel is 170-340 ℃.
3. The heavy duty diesel engine specific diesel fuel of claim 2, wherein the specific diesel fuel has a 50% distillation temperature of 250 to 253 ℃, a 90% distillation temperature of 316 to 318 ℃, and a 95% distillation temperature of 330 to 331 ℃.
4. The special diesel oil for heavy duty diesel engine according to claim 1, which is characterized in thatCharacterized in that the initial distillation point of the light diesel oil is 178-183 ℃ and the density is 828-835 kg/cm 3 The total aromatic hydrocarbon content is 17-18% m/m, the polycyclic aromatic hydrocarbon content is 3-3.3% m/m, the cetane number is 49-51, and the paraffin content is 36-40% m/m;
the initial distillation point of the indirect liquefied coal-to-diesel oil is 166-170 ℃ and the density is 770-780 kg/cm 3 The total aromatic hydrocarbon content is 2.7-3.3% m/m, the polycyclic aromatic hydrocarbon content is 1.7-2.3% m/m, the cetane number is 65-75, and the paraffin content is 75-85% m/m.
5. The diesel oil dedicated for a heavy duty diesel engine according to claim 4, wherein the light diesel oil has a distillation range of 178 to 345 ℃ and the indirect liquefied coal diesel oil has a distillation range of 166 to 350 ℃.
6. The heavy duty diesel engine specific diesel fuel of claim 5, wherein the light diesel fuel has a 50% distillation temperature of 248 to 250 ℃, a 90% distillation temperature of 312 to 316 ℃, and a 95% distillation temperature of 332 to 335 ℃;
the indirect liquefied coal-to-diesel oil has 50% distilling temperature of 290-300 deg.c, 90% distilling temperature of 330-340 deg.c and 95% distilling temperature of 343-347 deg.c.
7. The heavy duty diesel engine specific diesel fuel of claim 6, wherein said light weight diesel fuel has an initial boiling point of 178.4 ℃ and a density of 828.5kg/cm 3 The total aromatic hydrocarbon content was 17.9% m/m, the polycyclic aromatic hydrocarbon content was 3.0% m/m, the cetane number was 49.2, the paraffin content was 38.9% m/m, the 50% distillation temperature was 249.4 ℃, the 90% distillation temperature was 315.7 ℃, and the 95% distillation temperature was 332.5 ℃.
8. The diesel oil special for heavy duty diesel engine according to claim 6, wherein the indirect liquefied coal-made diesel oil has an initial boiling point of 168.9 ℃ and a density of 774.9kg/cm 3 The total aromatic hydrocarbon content is 3%m/m, the polycyclic aromatic hydrocarbon content is 2%m/m, the cetane number is 71.2, and the paraffin content is80% m/m, a 50% distillation temperature of 293.3 ℃, a 90% distillation temperature of 337 ℃, and a 95% distillation temperature of 346.6 ℃.
9. A method for preparing a diesel fuel dedicated to a heavy duty diesel engine according to any one of claims 1 to 8, comprising:
and sequentially introducing the light diesel oil and the indirect liquefied coal diesel oil into blending equipment, and mixing and circulating to obtain the special diesel oil for the heavy diesel engine.
10. The method for preparing diesel oil dedicated to a heavy duty diesel engine according to claim 9, characterized in that the mixing cycle time is 4 to 6 hours.
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