Test method for testing dispersion performance of oil for ships

Abstract

The invention discloses a test method for testing the dispersing performance of oil for ships, and relates to the technical field of oilfield development. According to the test method for testing the dispersing performance of the oil for the ship, a DT100 type machine spot tester is utilized, evaluation is completed through spots formed on filter paper under certain test conditions, and the dispersing performance of an oil sample is judged according to the diffusion distance of oil drops, the area of a middle soot area and the uniformity degree of comparison between the spots and a theoretical reference diameter. The operation is simple, the simulation test result has good correlation with the reality, and data support is provided for product development.

Description

Technical Field

[0001] The invention relates to the technical field of marine internal combustion engine oil, in particular to a test method for testing the dispersion performance of marine oil. Background Art

[0002] The IMO sulfur limit order has been in effect since January 1, 2020, stipulating that ships must use fuel with a low sulfur content of no more than 0.5%. Low sulfur oil mainly comes from blended oil, that is, low sulfur component light fuel oil is mixed and blended with high sulfur heavy fuel oil. A large number of studies have shown that except for the decrease in sulfur content, other physical and chemical indicators and combustion performance of low sulfur oil have not been improved. On the contrary, a large number of inferior blended fuels have entered the shipping market, causing great damage to the equipment during use, paint film on the cylinder wall, excessive wear of the cylinder liner, etc. This is mainly related to the large amount of colloid, asphaltene and catalytic particles contained in low sulfur oil. The low sulfur oil mixed in the lubricating oil and the viscous deposits formed by incomplete combustion products gather in the ring groove, sinter and harden under high temperature, and then cause a series of failures such as piston ring failure and cylinder pulling. In order to cope with the characteristics of low sulfur fuel oil combustion process, it is necessary to develop new products to solve the above problems. How to improve the cleaning and dispersion performance of oil products and solve a series of problems caused by low sulfur oil has become the key to new product development. There is currently a lack of laboratory testing methods to guide the adjustment of additive ingredients and content during product development.

[0003] Through new research, it was found that there are no reports on experimental methods using spot dispersion instrument to study the dispersion properties of marine oil at home and abroad. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a test method for testing the dispersibility of marine oil, which solves the problem that no spot dispersion instrument has been used to study the dispersibility of marine oil at home and abroad.

[0005] To achieve the above purpose, the present invention is implemented by the following technical scheme: a test method for testing the dispersibility of marine oil, taking 60g of marine medium-speed engine oil and 5-10g of heavy marine fuel oil, mixing, heating to a certain temperature, stirring, preparing a mixed oil liquid, using a micropipette to draw the mixed oil droplets on a special horizontally placed filter paper, the filter paper with oil spots is placed horizontally in a laboratory drying oven set at 70℃-90℃ for drying, and then using a DT100 dispersibility tester to measure the dispersibility of the oil product to obtain the test results.

[0006] Preferably, the medium-speed engine oil is divided into A and B according to the amount of salicylate added.

[0007] Preferably, the sulfur content of the heavy marine fuel oil is 0.72%±0.5, and the density is 950-1000kg / m3.

[0008] Preferably, the medium speed engine oil is mixed with heavy marine fuel oil and heated to 60°C, with a temperature difference of no more than ±2°C.

[0009] Preferably, the stirring time of the marine medium-speed engine oil and the heavy marine fuel oil is 240 minutes.

[0010] Preferably, the micropipette accurately absorbs 20ul of the mixed oil.

[0011] Preferably, the drying time in the laboratory drying oven is 60 minutes.

[0012] Preferably, the DT100 dispersibility tester is a spot dispersometer.

[0013] Preferably, the temperature inside the laboratory drying oven is 60°C-90°C.

[0014] Beneficial Effects

[0015] The present invention provides a test method for testing the dispersibility of marine oil. Compared with the prior art, it has the following beneficial effects:

[0016] This test method for testing the dispersibility of marine oil uses a DT100 machine spot tester to complete the evaluation through spots formed on filter paper under certain test conditions. The dispersibility of the oil sample is determined by the oil droplet diffusion distance, the area of ​​the intermediate soot region, and the uniformity of the spots compared with the theoretical reference diameter. The operation is simple, and the simulation test results have a good correlation with the actual results, providing data support for product development. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example 1: A test method for testing the dispersibility of marine oil, 60g of marine medium-speed engine oil and 5-10g of heavy marine fuel oil are mixed, heated to a certain temperature, stirred, and prepared into a mixed oil liquid, the mixed oil liquid is sucked by a micropipette and dropped on a special horizontally placed filter paper, the filter paper with oil spots is placed horizontally in a laboratory drying oven for drying, and then the dispersibility of the oil product is measured by a DT100 dispersibility tester to obtain the test results;

[0019] The amount of salicylate added to the medium-speed engine oil is A60g, the sulfur content of the heavy marine fuel oil is 0.72%±0.5, the density is 950-1000kg / m3, the medium-speed engine oil and the heavy marine fuel oil are mixed and heated to 60°C, the temperature difference does not exceed ±2°C, the stirring time of the marine medium-speed engine oil and the heavy marine fuel oil is 240min, the mixed oil accurately sucked by the micropipette is 20ul, the drying time in the laboratory drying oven is 60 minutes, and the temperature in the laboratory drying oven is 80°C;

[0020] Specifically, the sulfur content of heavy marine fuel oil is 0.72%±0.5, and the density is 950-1000kg / m3. In order to ensure that the asphaltene, colloid and other components added to the oil that require the detergent dispersant to work are kept within a certain range, 60g of marine medium-speed engine oil A is mixed with 5g of heavy marine fuel oil and heated to 60°C with a temperature difference of no more than ±2°C. The mixture is stirred for 240 minutes to prepare a mixed oil liquid. A micropipette is used to accurately draw 20ul of the mixed oil droplets on a special horizontally placed filter paper. The filter paper with oil spots is placed horizontally in a laboratory drying oven set at 80°C and dried for 60 minutes. The dispersion performance of the oil product is measured with a DT100 dispersibility tester. The (dispersibility) DP value is 1.5, and the (comprehensive score) MD is 92 points.

[0021] Example 2: A test method for testing the dispersibility of marine oil, 60g of marine medium-speed engine oil and 5-10g of heavy marine fuel oil are mixed, heated to a certain temperature, stirred, and prepared into a mixed oil liquid, the mixed oil liquid is sucked with a micropipette and dropped on a special horizontally placed filter paper, the filter paper with oil spots is placed horizontally in a laboratory drying oven for drying, and then the dispersibility of the oil product is measured with a DT100 dispersibility tester to obtain the test results;

[0022] The amount of salicylate added to the medium-speed engine oil is A60g, the sulfur content of the heavy marine fuel oil is 0.72%±0.5, the density is 950-1000kg / m3, the medium-speed engine oil and the heavy marine fuel oil are mixed and heated to 60°C, the temperature difference does not exceed ±2°C, the stirring time of the marine medium-speed engine oil and the heavy marine fuel oil is 240min, the mixed oil accurately sucked by the micropipette is 20ul, the drying time in the laboratory drying oven is 60 minutes, and the temperature in the laboratory drying oven is 70°C;

[0023] Specifically, the sulfur content of heavy marine fuel oil is 0.72%±0.5, and the density is 950-1000kg / m3. In order to ensure that the asphaltene, colloid and other components added to the oil that require the detergent dispersant to work are kept within a certain range, 60g of marine medium-speed engine oil A is mixed with 10g of heavy marine fuel oil and heated to 60°C with a temperature difference of no more than ±2°C. It is stirred for 240 minutes to prepare a mixed oil liquid. 20ul of the mixed oil liquid is accurately drawn with a micropipette and dropped on a special horizontally placed filter paper. The filter paper with oil spots is placed horizontally in a laboratory drying oven set at 70°C and dried for 60 minutes. The dispersion performance of the oil product is measured with a DT100 dispersibility tester. The (dispersibility) DP value is 2.5, and the (comprehensive score) MD is 92 points.

[0024] Example 3: A test method for testing the dispersibility of marine oil, taking 60g of marine medium-speed engine oil and 5-10g of heavy marine fuel oil, mixing, heating to a certain temperature, stirring, preparing a mixed oil liquid, using a micropipette to draw the mixed oil droplets on a special horizontally placed filter paper, the filter paper with oil spots is placed horizontally in a laboratory drying oven to dry, and then the dispersibility of the oil product is measured by a DT100 dispersibility tester to obtain the test results;

[0025] The amount of salicylate added to the medium-speed engine oil is A60g, the sulfur content of the heavy marine fuel oil is 0.72%±0.5, the density is 950-1000kg / m3, the medium-speed engine oil and the heavy marine fuel oil are mixed and heated to 60°C, the temperature difference does not exceed ±2°C, the stirring time of the marine medium-speed engine oil and the heavy marine fuel oil is 240min, the mixed oil accurately sucked by the micropipette is 20ul, the drying time in the laboratory drying oven is 60 minutes, and the temperature in the laboratory drying oven is 90°C;

[0026] Specifically, the sulfur content of heavy marine fuel oil is 0.72%±0.5, and the density is 950-1000kg / m3. In order to ensure that the asphaltene, colloid and other components added to the oil that require the detergent and dispersant to work are kept within a certain range, 60g of marine medium-speed engine oil A is mixed with 30g of heavy marine fuel oil and heated to 60°C with a temperature difference of no more than ±2°C. It is stirred for 240 minutes to prepare a mixed oil liquid. 20ul of the mixed oil liquid is accurately drawn with a micropipette and dropped on a special horizontally placed filter paper. The filter paper with oil spots is placed horizontally in a laboratory drying oven set at 90°C and dried for 60 minutes. The dispersion performance of the oil product is measured with a DT100 dispersibility tester. The (dispersibility) DP value is 6.5, and the (comprehensive score) MD is 71 points.

[0027] Example 4: A test method for testing the dispersibility of marine oil, 60g of marine medium-speed engine oil and 5-10g of heavy marine fuel oil are mixed, heated to a certain temperature, stirred, and prepared into a mixed oil liquid, the mixed oil liquid is sucked with a micropipette and dropped on a special horizontally placed filter paper, the filter paper with oil spots is placed horizontally in a laboratory drying oven for drying, and then the dispersibility of the oil product is measured with a DT100 dispersibility tester to obtain the test results;

[0028] The amount of salicylate added to the medium-speed engine oil is B60g, the sulfur content of the heavy marine fuel oil is 0.72%±0.5, the density is 950-1000kg / m3, the medium-speed engine oil and the heavy marine fuel oil are mixed and heated to 60°C, the temperature difference does not exceed ±2°C, the stirring time of the marine medium-speed engine oil and the heavy marine fuel oil is 240min, the mixed oil accurately sucked by the micropipette is 20ul, the drying time in the laboratory drying oven is 60 minutes, and the temperature in the laboratory drying oven is 90°C;

[0029] Specifically, the sulfur content of heavy marine fuel oil is 0.72%±0.5, and the density is 950-1000kg / m3. In order to ensure that the asphaltene, colloid and other components added to the oil that require the detergent and dispersant to work are kept within a certain range, 60g of marine medium-speed engine oil B is mixed with 30g of heavy marine fuel oil and heated to 60°C with a temperature difference of no more than ±2°C. It is stirred for 240 minutes to prepare a mixed oil liquid. 20ul of the mixed oil liquid is accurately drawn with a micropipette and dropped on a special horizontally placed filter paper. The filter paper with oil spots is placed horizontally in a laboratory drying oven set at 90°C and dried for 60 minutes. The dispersion performance of the oil product is measured with a DT100 dispersibility tester. The (dispersibility) DP value is 6.5, and the (comprehensive score) MD is 66 points.

[0030] Example 5: A test method for testing the dispersibility of marine oil, 60g of marine medium-speed engine oil and 5-10g of heavy marine fuel oil are mixed, heated to a certain temperature, stirred, and prepared into a mixed oil liquid, the mixed oil liquid is sucked with a micropipette and dropped on a special horizontally placed filter paper, the filter paper with oil spots is placed horizontally in a laboratory drying oven for drying, and then the dispersibility of the oil product is measured with a DT100 dispersibility tester to obtain the test results;

[0031] The amount of salicylate added to the medium-speed engine oil is B60g, the sulfur content of the heavy marine fuel oil is 0.72%±0.5, the density is 950-1000kg / m3, the medium-speed engine oil and the heavy marine fuel oil are mixed and heated to 60°C, the temperature difference does not exceed ±2°C, the stirring time of the marine medium-speed engine oil and the heavy marine fuel oil is 240min, the mixed oil accurately sucked by the micropipette is 20ul, the drying time in the laboratory drying oven is 60 minutes, and the temperature in the laboratory drying oven is 80°C;

[0032] Specifically, the sulfur content of heavy marine fuel oil is 0.72% ± 0.5, and the density is 950-1000kg / m3. In order to ensure that the asphaltene, colloid and other components added to the oil that require the detergent dispersant to work are kept within a certain range, 60g of marine medium-speed engine oil B is mixed with 5g of heavy marine fuel oil and heated to 60°C. The temperature difference does not exceed ±2°C, and it is stirred for 240 minutes to prepare a mixed oil liquid. Use a micropipette to accurately draw 20ul of the mixed oil droplets on a special horizontally placed filter paper. The filter paper with oil spots is placed horizontally in a laboratory drying oven set at 80°C and dried for 60 minutes. The dispersion performance of the oil product is measured using a DT100 dispersibility tester. The (dispersibility) DP value is 2.5, and the (comprehensive score) MD is 86 points.

[0033] Example 6: A test method for testing the dispersibility of marine oil, 60g of marine medium-speed engine oil and 5-10g of heavy marine fuel oil are mixed, heated to a certain temperature, and stirred to prepare a mixed oil liquid, and the mixed oil liquid is sucked with a micropipette and dropped on a special horizontally placed filter paper, and the filter paper with oil spots is placed horizontally in a laboratory drying oven to dry, and then the dispersibility of the oil product is measured with a DT100 dispersibility tester to obtain the test results;

[0034] The amount of salicylate added to the medium-speed engine oil is B60g, the sulfur content of the heavy marine fuel oil is 0.72%±0.5, the density is 950-1000kg / m3, the medium-speed engine oil and the heavy marine fuel oil are mixed and heated to 60°C, the temperature difference does not exceed ±2°C, the stirring time of the marine medium-speed engine oil and the heavy marine fuel oil is 240min, the mixed oil accurately sucked by the micropipette is 20ul, the drying time in the laboratory drying oven is 60 minutes, and the temperature in the laboratory drying oven is 70°C;

[0035] Specifically, the sulfur content of heavy marine fuel oil is 0.72%±0.5, and the density is 950-1000kg / m3. In order to ensure that the asphaltene, colloid and other components added to the oil that require the detergent dispersant to work are kept within a certain range, 60g of marine medium-speed engine oil B is mixed with 10g of heavy marine fuel oil and heated to 60°C with a temperature difference of no more than ±2°C. It is stirred for 240 minutes to prepare a mixed oil liquid. 20ul of the mixed oil liquid is accurately drawn with a micropipette and dropped on a special horizontally placed filter paper. The filter paper with oil spots is placed horizontally in a laboratory drying oven set at 70°C and dried for 60 minutes. The dispersion performance of the oil product is measured with a DT100 dispersibility tester. The (dispersibility) DP value is 2.25, and the (comprehensive score) MD is 89 points.

[0036] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A test method for testing the dispersibility of marine oil, characterized in that: Take 60g of medium-speed marine engine oil and 5-10g of heavy marine fuel oil, mix them, heat them to a certain temperature, stir them, and prepare a mixed oil liquid. Use a micropipette to draw drops of the mixed oil liquid on a special horizontally placed filter paper, and place the filter paper with oil spots horizontally in a laboratory drying oven to dry, and then use the DT100 dispersibility tester to measure the dispersion performance of the oil product and obtain the test results.

2. A test method for testing the dispersibility of marine oil according to claim 1, characterized in that: The medium-speed engine oil is divided into A and B according to the amount of salicylate added.

3. A test method for testing the dispersibility of marine oil according to claim 1, characterized in that: The sulfur content of the heavy marine fuel oil is 0.72%±0.5, and the density is 950-1000kg / m3.

4. A test method for testing the dispersibility of marine oil according to claim 1, characterized in that: The medium speed engine oil is mixed with heavy marine fuel oil and heated to 60°C, with a temperature difference of no more than ±2°C.

5. A test method for testing the dispersibility of marine oil according to claim 1, characterized in that: The mixing time of the medium-speed engine oil for ships and the heavy fuel oil for ships is 240 minutes.

6. A test method for testing the dispersibility of marine oil according to claim 1, characterized in that: The micropipette can accurately absorb 20ul of the mixed oil.

7. A test method for testing the dispersibility of marine oil according to claim 1, characterized in that: The drying time in the laboratory drying oven is 50-70 minutes.

8. A test method for testing the dispersibility of marine oil according to claim 1, characterized in that: The DT100 dispersibility tester is a spot dispersibility tester.

9. A test method for testing the dispersibility of marine oil according to claim 1, characterized in that: The temperature inside the laboratory drying oven is 60°C-90°C.