Marine oil separation device and method

Abstract

The marine oil water separation device comprises a separator and an oil storage tank which are connected through a separator oil return pipe and a separator oil inlet pipe respectively, a stirring device is arranged in the oil storage tank, and the oil storage tank is connected with an oil supplement tank through an oil supplement pipe. The marine oil water separation method comprises the following steps: firstly, adding oil into the oil storage tank, starting an oil pump b to form oil circulation; heating the circulating oil, discharging the heated oil through a discharge pipe when the oil reaches a set temperature; adding oil into the oil storage tank again, stirring the oil through a stirring paddle, and then heating the oil until the oil reaches a set temperature, adding water through a water inlet, and stirring the water and the oil for 1-3 hours to form mixed oil; setting a separation flow and a separation temperature of the separator, and centrifugally separating the mixed oil when the mixed oil reaches the set temperature. The marine oil water separation device and the water separation method can more accurately evaluate the water separation performance of marine oil.

Description

Technical Field

[0001] This invention belongs to the technical field of marine internal combustion engine equipment, specifically relating to a marine oil-water separator, and also to a water separation method of the above-mentioned water separator. Background Technology

[0002] Marine engines are more likely to be flooded at sea than on land. Marine oil typically follows the OEM's recommendations for water content during oil changes. If water gets into the engine and contaminates the oil, it is unknown whether the water can be separated by centrifugation and how long it would take. If the flooded oil is sent to an onshore laboratory, the results will affect the ship's normal navigation plans.

[0003] Currently, the oil-water separation methods referenced in marine oil research and development include the petroleum synthetic liquid water separation test method and the marine oil-water separation test method. However, both methods differ significantly from the oil separators used on actual ships. Marine centrifugal oil separators work on the principle that, due to the different densities of oil, water, and impurities, under the influence of centrifugal force during high-speed rotation, the oil, water, and impurities are redistributed radially along the rotating shaft, thus separating water and impurities. Existing marine oil-water separation methods result in a redistribution of oil and water after centrifugation, with the denser water at the bottom of the centrifuge tube and the less dense oil at the top. In contrast, the petroleum synthetic liquid water separation test method relies on natural sedimentation without a centrifugal separation process. This leads to discrepancies between laboratory water separation performance evaluations and practical applications during product development and raw material expansion. Summary of the Invention

[0004] The purpose of this invention is to provide a marine oil-water separator that is better suited to the working conditions of centrifugal oil separators used on ships.

[0005] Another object of the present invention is to provide a method for separating marine oil using the above-mentioned water separating device, which can more accurately evaluate the water separating performance of marine oil.

[0006] The first technical solution adopted in this invention is a marine oil-water separator, which includes an oil separator and an oil storage tank connected by an oil separator return pipe and an oil separator inlet pipe, respectively. The oil storage tank is equipped with a stirring device, and the oil storage tank is also connected to a replenishment tank through a refueling pipe.

[0007] The first technical solution of the present invention is further characterized in that,

[0008] The oil separator is connected to a control panel via wiring. The oil separator is also connected to a steam heating pipe, which is equipped with a shut-off valve b.

[0009] An oil pump b is installed on the oil inlet pipe of the oil separator. An oil drain pipe is connected between the oil pump b and the oil storage tank on the oil inlet pipe of the oil separator. A shut-off valve a is installed on the oil drain pipe.

[0010] The stirring device includes a stirring paddle installed inside an oil storage tank. The stirring paddle is connected to a motor via a wiring connection, and a water inlet is opened at the top of the oil storage tank.

[0011] The refueling pipe is equipped with an oil pump a.

[0012] Another technical solution adopted in this invention is a marine oil-water separation method, comprising the following steps:

[0013] Step 1: Add 40L to 60L of the oil to be tested to the oil storage tank through oil pump a, and then turn on oil pump b to make the oil to be tested circulate between the oil storage tank and the oil separator.

[0014] Step 2: Start the steam heating pipe to heat the circulating oil to the set temperature and then release it through the drain pipe;

[0015] Step 3: Add 40L to 60L of the oil to be tested to the oil storage tank again, stir the oil to be tested with a stirring paddle, heat the oil to be tested to the set temperature with a steam heating pipe, add water through the water inlet, and continue to stir the water and oil to form a mixed oil for 1 to 3 hours.

[0016] Step 4: Set the separation flow rate and separation temperature of the oil separator. When the mixed oil reaches the set temperature, start the centrifugal separation of the oil separator to separate the mixed oil until the oil and water are separated.

[0017] Another feature of the present invention is that,

[0018] In steps 2 and 3, the temperature is set to 55℃~65℃.

[0019] The mass ratio of water to oil added in step 3 is water:oil = 1~2:25~50.

[0020] In step 4, the separation flow rate is 0.5 m³ / s. 3 / h~1.0m 3 / h, separation temperature is 85℃~95℃.

[0021] In step 4, the mixed oil is centrifuged for 1 to 4 hours.

[0022] The beneficial effects of this invention are:

[0023] (1) The oil separator of the marine oil-water separator of the present invention uses the Alfa Laval PA605 oil separator to conduct oil-water separation test, so that the result after oil-water separation is closer to the result in actual application, which greatly improves the evaluation of marine oil-water separation performance. Moreover, the marine oil-water separator of the present invention has a simple structure and is easy to assemble.

[0024] (2) The marine oil-water separation method of the present invention can be carried out on the ship without having to return the ship to a land laboratory, which greatly saves the ship's sailing time. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the marine oil-water separator of the present invention.

[0026] In the diagram, 1. Oil separator, 2. Oil storage tank, 3. Oil replenishment tank, 4. Control panel, 5. Motor, 6. Agitator, 7. Water inlet, 8. Shut-off valve a, 9. Oil pump a, 10. Oil pump b, 11. Shut-off valve b, 12. Oil separator inlet pipe, 13. Oil separator return pipe, 14. Oil filling pipe, 15. Oil drain pipe, 16. Steam heating pipe. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0028] The structure of the marine oil-water separator of the present invention is as follows: Figure 1 As shown, the oil separator 1 is connected to the control panel 4 via an electrical circuit. The oil separator 1 is an Alfa Laval PA605 oil separator. The control panel 4 is used to set the oil separator flow rate, oil heating temperature, separation temperature, etc. A steam heating pipe 16 is connected to the side wall of the oil separator 1 to heat the oil. A shut-off valve b11 is installed on the heating pipe 16.

[0029] Oil separator 1 is connected to oil storage tank 2 via oil separator return pipe 13. Oil storage tank 2 is then connected to oil separator 1 via oil separator inlet pipe 12, forming a circulation between oil storage tank 2 and oil separator 1. When the oil temperature is lower than the set separation temperature, the oil does not enter the separation cylinder of oil separator 1, but returns directly to oil storage tank 2 for continuous circulation and heating. Oil pump b10 is installed on oil separator inlet pipe 12. Oil drain pipe 15 is connected between oil pump b10 and oil storage tank 2 on oil separator inlet pipe 12. Stop valve a8 is installed on oil drain pipe 15.

[0030] The oil storage tank 2 is connected to the oil replenishment tank 3 via the oil filling pipe 14, and the oil filling pipe 14 is equipped with an oil pump a9.

[0031] The oil storage tank 2 has a water inlet 7 on the top and a stirring device is installed inside the oil storage tank 2. The stirring device includes a stirring paddle 6 installed inside the oil storage tank 2. The stirring paddle 6 is connected to a motor 5 on the outside of the oil storage tank 2 through an electrical circuit. The motor 5 drives the stirring paddle 6 to mix oil and water.

[0032] The present invention provides a marine oil-water separation method using a marine oil-water separation device, specifically comprising the following steps:

[0033] Step 1: Add 40L to 60L of the oil to be tested to the oil storage tank 2 through oil pump a9, and then turn on oil pump b10 to make the oil to be tested circulate between the oil storage tank 2 and the oil separator 1.

[0034] Step 2: Start the steam heating pipe 16 to heat the circulating oil to 55℃~65℃ and then release it through the oil drain pipe 15;

[0035] Step 3: Add 40L to 60L of the oil to be tested to the oil storage tank 2 again, stir the oil to be tested with the agitator 6, heat the oil to be tested to 55℃ to 65℃, and then add water through the water inlet 7. The mass ratio of water to oil is water: oil = 1 to 2: 25 to 50. Continue stirring the water and oil for 1 to 3 hours until a mixed oil is formed.

[0036] Step 4: Set the separation flow rate of oil separator 1 to 0.5 m³ / s. 3 / h~1.0m 3 / h, the separation temperature is 85℃~95℃. When the mixed oil is heated to 85℃~95℃, it enters the separation cylinder of oil separator 1. The centrifugal separation of oil separator 1 is started, and the mixed oil is centrifuged for 1h~4h until the oil and water are separated.

[0037] After separation, the separated oil is sampled and tested for two indicators: alkalinity and moisture content. Depending on the type of engine used on the ship, if the engine is a standard model, it can be used normally when the moisture content is below 0.5%. If the engine is an electronically controlled common rail engine, it can be used when the moisture content is below 0.2%.

[0038] Example 1

[0039] Step 1: Start oil pump a9 and add 40L of oil a into oil storage tank 2. Turn on oil pump b10 to form oil circulation.

[0040] Step 2: Start the steam heating pipe 16 to heat the circulating oil to 55°C and then release it through the oil drain pipe 15;

[0041] Step 3: Add 40L of oil to the oil storage tank 2 again, stir the added oil with the agitator 6, heat the oil to 55°C, and after the oil reaches the set temperature, add water through the water inlet 7. The mass ratio of water to oil is water:oil = 1:25. Continue stirring the water and oil for 1 hour.

[0042] Step 4: After stirring is complete, set the separation flow rate of oil separator 1 to 0.5 m³ / s. 3 / h, the separation temperature is 85℃. When the mixed oil reaches the separation temperature, the mixed oil enters the separation cylinder of oil separator 1. The centrifugal separation of oil separator 1 is started, and the mixed oil is centrifuged for 1 hour until the oil and water are separated.

[0043] After the mixed oil is separated, samples are taken from the separated oil, and the alkalinity and moisture content are measured as shown in the table below:

[0044]

[0045] Example 2

[0046] Step 1: Start oil pump a9, add 50L of oil b to oil storage tank 2, and start oil pump b10 to form oil circulation;

[0047] Step 2: Start the steam heating pipe 16 to heat the circulating oil to 60°C and then release it through the oil drain pipe 15;

[0048] Step 3: Add 50L of oil to the oil storage tank 2 again, stir the oil with the agitator 6, heat the oil to 60°C, and after the oil reaches the set temperature, add water through the water inlet 7. The mass ratio of water to oil is water:oil = 2:50. Continue stirring the water and oil for 2 hours.

[0049] Step 4: After stirring is complete, set the separation flow rate of oil separator 1 to 0.8 m³ / s. 3 / h, the separation temperature is 90℃. When the mixed oil reaches the separation temperature, the mixed oil enters the separation cylinder of oil separator 1. The centrifugal separation of oil separator 1 is started, and the mixed oil is centrifuged for 2 hours until the oil and water are separated.

[0050] After the mixed oil is separated, samples are taken from the separated oil, and the alkalinity and moisture content are measured as shown in the table below:

[0051]

[0052] Example 3

[0053] Step 1: Start oil pump a9, add 60L of oil c to oil storage tank 2, and start oil pump b10 to form oil circulation;

[0054] Step 2: Start the steam heating pipe 16 to heat the circulating oil to 65°C and then release it through the oil drain pipe 15;

[0055] Step 3: Add 60L of oil to the oil storage tank 2 again, stir the added oil with the agitator 6, heat the oil to 65°C, and after the oil reaches the set temperature, add water through the water inlet 7. The mass ratio of water to oil is water:oil = 1:50. Continue stirring the water and oil for 3 hours.

[0056] Step 4: After stirring is complete, set the separation flow rate of oil separator 1 to 1.0 m³ / s. 3 / h, the separation temperature is 95℃. When the mixed oil reaches the separation temperature, the mixed oil enters the separation cylinder of oil separator 1. The centrifugal separation of oil separator 1 is started, and the mixed oil is centrifuged for 3 hours until the oil and water are separated.

[0057] After the mixed oil is separated, samples are taken from the separated oil, and the alkalinity and moisture content are measured as shown in the table below:

[0058]

[0059] Comparative Example

[0060] The water separation performance of oil body c was tested using an oil-water separation method to evaluate whether its water separation performance met the engine's operating requirements. The specific steps are as follows.

[0061] Step 1: First, add 50ml of oil c to the centrifuge tube, then add 2ml of distilled water, and finally add more oil c to the test tube until the mixed oil in the centrifuge tube reaches 100ml.

[0062] Step 2: Stir the mixed oil in the centrifuge tube at a speed of 3600 r / min for 30 s.

[0063] Step 3: Lift the stirrer from the centrifuge tube and suspend it above the centrifuge tube for 2 minutes to allow the remaining oil mixture in the stirrer to drip into the centrifuge tube.

[0064] Step 4: Place the centrifuge tubes into the centrifuge, making sure the tubes are placed symmetrically to maintain balance. Start the centrifuge, set the relative centrifugal force to 700, and the centrifugation time to 2 hours.

[0065] Step 6: Remove the centrifuge tube from the centrifuge and measure the contents of the water and emulsion in the centrifuge tube. The results show that the water content is 1.1 ml and the emulsion content is 0.2 ml.

[0066] According to the regulations for oil-water separation methods, oil with a water content of not less than 1.2 ml and an emulsion content of not more than 0.5 ml after separation can be used for marine engines. Therefore, oil c measured by the oil-water separation method does not meet the requirements for use in marine engines. However, according to the data measured in Example 3, the water content of oil c after separation is 0.1%, which meets the standard of less than 0.2% water content and can be used as marine engine oil. Oil c was actually applied to a marine engine, and its actual water separation performance was tested. The results showed that oil c performed excellently, and the mixed water in the oil could be well separated by centrifugation. This verifies that the marine oil water separation method of the present invention is closer to actual marine applications than the prior art and can more accurately evaluate the water separation performance of marine oil.

Claims

1. A marine oil-water separator, characterized in that, It includes an oil separator (1) and an oil storage tank (2) connected by an oil separator return pipe (13) and an oil separator inlet pipe (12) respectively. The oil storage tank (2) is equipped with a stirring device and is also connected to a refueling tank (3) through a refueling pipe. The oil separator (1) is connected to a control panel (4) via a line. The oil separator (1) is connected to a steam heating pipe (16). A shut-off valve b (11) is installed on the steam heating pipe (16). An oil pump b (10) is installed on the oil inlet pipe (12) of the oil separator. An oil drain pipe (15) is connected between the oil pump b (10) and the oil storage tank (2) on the oil inlet pipe (12). A shut-off valve a (8) is installed on the oil drain pipe (15). The stirring device includes a stirring paddle (6) installed in the oil storage tank (2), the stirring paddle (6) is connected to a motor (5) via a line, and the top of the oil storage tank (2) has a water inlet (7). An oil pump a (9) is installed on the refueling pipe (14).

2. A method for separating oil and water on ships, characterized in that, Using the marine oil-water separator as described in claim 1 includes the following steps: Step 1: Add 40L~60L of the oil to be tested to the oil storage tank (2) through oil pump a (9), and then turn on oil pump b (10) to make the oil to be tested circulate between the oil storage tank (2) and the oil separator (1); Step 2: Start the steam heating pipe (16) to heat the circulating oil to the set temperature and then discharge it through the oil drain pipe (15); Step 3: Add 40L~60L of the oil to be tested to the oil storage tank (2) again, stir the oil to be tested with the stirring paddle (6), heat the oil to be tested to the set temperature with the steam heating pipe (16), add water through the water inlet (7), and continue to stir the water and oil to form a mixed oil body for 1h~3h. Step 4: Set the separation flow rate and separation temperature of the oil separator (1). When the mixed oil reaches the set temperature, start the centrifugal separation of the oil separator (1) to centrifuge the mixed oil until the oil and water are separated.

3. The marine oil-water separation method according to claim 2, characterized in that, The temperature is set to 55℃~65℃ in steps 2 and 3.

4. The marine oil-water separation method according to claim 2, characterized in that, The mass ratio of water to oil added in step 3 is water:oil = 1~2:25~50.

5. The marine oil-water separation method according to claim 2, characterized in that, The separation flow rate in step 4 is 0.5 m³ / s. 3 / h~1.0m 3 / h, separation temperature is 85℃~95℃.

6. The marine oil-water separation method according to claim 2, characterized in that, In step 4, the centrifugation time for the mixed oil is 1 to 4 hours.

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