Marine gas turbine lubricating oil system and method of adjusting the same

Abstract

The application relates to a marine gas turbine lubricating oil system and an adjusting method thereof, which comprises a lubricating oil pump, an oil supply main pipeline and an oil return main pipeline are led out of the lubricating oil pump, a lubricating oil adjusting screw is arranged on the lubricating oil pump, a gas turbine body, a lubricating oil pressure adjusting box and a lubricating oil pressure adjusting assembly are arranged on the oil supply main pipeline along the lubricating oil flow direction, high-pressure compressor rear bearing oil return pipelines and low-pressure turbine rear bearing oil return pipelines are connected between the gas turbine body and the lubricating oil pressure adjusting box, a coarse adjusting screw rod and a fine adjusting screw are arranged on the lubricating oil pressure adjusting assembly, lubricating oil output by the lubricating oil pressure adjusting assembly flows into a lubricating oil separator, the lubricating oil separator is communicated with the oil return main pipeline, and the lubricating oil returns to the lubricating oil pump. The lubricating oil pressure in the operation process of the gas turbine is adjusted in a preliminary judgment and secondary regulation mode, and the lubricating oil pressure of all bearings and lubricating oil chambers always meets the operation requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas turbine technology, in particular to a marine gas turbine lubricating oil system and an adjusting method thereof. BACKGROUND

[0002] As a high-speed rotating power device, the marine gas turbine generates a large amount of heat between bearing shells during work with high-frequency variable working conditions. In order to remove hard inclusions formed between various joint surfaces in the bearing cavity and remove heat generated by friction and transferred to the lubricating oil in the high-temperature area, the gas turbine needs a lubricating oil system for lubrication.

[0003] With the operation of the gas turbine, the operating state of the oil pump will change, and the graphite sealing state of the oil bearing chamber will also change. In order to ensure that the lubrication of each bearing and the oil pressure in the oil chamber meet the requirements, the oil system needs to be adjusted to ensure the stable operation of the gas turbine.

[0004] After the first installation of the gas turbine, the oil supply pressure of the oil system and the oil pressure in the bearing chamber are generally not within the operating requirements. After the gas turbine operates for a certain period of time, the operating state of the oil pump will change, and the graphite sealing state of the oil bearing chamber will also change. Thus, the oil supply pressure and the oil pressure in the bearing chamber will also change and will not be within the operating requirements. If the oil system is not adjusted, bearing wear will occur with operation, and a major accident will occur. SUMMARY

[0005] In view of the above-mentioned shortcomings in the prior production technology, the present applicant provides a marine gas turbine lubricating oil system and an adjusting method thereof. After the gas turbine is put into operation, a series of lubricating oil system debugging is performed to ensure the stable operation of the gas turbine.

[0006] The technical solutions adopted by the present application are as follows:

[0007] A marine gas turbine lubricating oil system comprises an oil pump, an oil supply main pipeline and an oil return main pipeline are led out of the oil pump, and an oil adjusting screw is arranged on the oil pump,

[0008] A gas turbine body, an oil pressure adjusting tank, and an oil pressure adjusting assembly are arranged on the oil supply main pipeline along the flow direction of the oil,

[0009] A high-pressure compressor rear bearing oil return pipeline and a low-pressure turbine rear bearing oil return pipeline are connected between the gas turbine body and the oil pressure adjusting tank, a coarse adjusting screw and a fine adjusting screw are arranged on the oil pressure adjusting assembly, and the oil output by the oil pressure adjusting assembly flows into an oil separator,

[0010] The oil separator is communicated with the oil return main pipeline, and the oil returns to the oil pump.

[0011] As a further improvement of the above technical solution:

[0012] The gas turbine body and the oil pressure regulating tank are both connected with a backflow branch, and the backflow branch is connected to an oil return main pipeline.

[0013] The oil return pump is provided with a machine belt oil suction pipeline and a machine belt oil return pipeline.

[0014] A method for adjusting a marine gas turbine oil system, comprising the following steps:

[0015] Step one: under the slow speed working condition, judging the relationship between the oil supply pressure and the oil supply range;

[0016] Step two: if the oil supply pressure is less than the oil supply range, then rotate the adjusting screw to increase the pressure until the oil supply pressure meets the expected requirement;

[0017] If the oil supply pressure is greater than the oil supply range, then rotate the adjusting screw in the opposite direction to reduce the pressure until the oil supply pressure meets the expected requirement;

[0018] After the oil supply pressure meets the expectation, the gas turbine body runs in the full power range, and the sealing pressure drop of the oil chamber at the high-pressure compressor rear bearing and the low-pressure turbine rear bearing is calculated by the following formula:

[0019] ΔP 高压后轴承腔室 =P 低压压气机 - P 高压压气机后轴承密封空气管路 - P 滑油压力调节箱

[0020] ΔP 低压涡轮后轴承腔室 =P 低压压气机 -P 低压涡轮后轴承密封空气管路 -P 滑油压力调节箱

[0021] In the formula:

[0022] ΔP 高压后轴承腔室 is the sealing pressure drop of the oil chamber at the high-pressure compressor rear bearing,

[0023] P 低压压气机 is the static pressure measured at the low-pressure compressor rear;

[0024] P 高压压气机后轴承密封空气管路 is the static pressure loss of the pipeline for sending air from the low-pressure compressor rear to the high-pressure compressor rear bearing;

[0025] P 滑油压力调节箱 is the pressure of the oil pressure regulating tank;

[0026] ΔP 低压涡轮后轴承腔室 is the sealing pressure drop of the oil chamber at the low-pressure turbine rear bearing;

[0027] P 低压涡轮后轴承密封空气管路 The static pressure loss of the pipeline sending air from the low-pressure compressor rear to the low-pressure turbine rear bearing;

[0028] The above units are MPa;

[0029] ΔP 高压后轴承腔室 The value range of ΔP 低压涡轮后轴承腔室 is required to fall within the same pressure range;

[0030] Step three: calculate the value of ΔP 低压涡轮后轴承腔室 of the gas turbine at 50% power, and determine whether the value falls within the expected pressure range; according to the size relationship between the value and the expected pressure range, adjust the oil pressure regulating assembly so that the value of ΔP 低压涡轮后轴承腔室 of the gas turbine at 50% power falls within the expected pressure range.

[0031] As a further improvement of the above technical solution:

[0032] ΔP 高压后轴承腔室 The value range of ΔP 低压涡轮后轴承腔室 is required to fall within 0-0.15 MPa.

[0033] In step three,

[0034] If the value of ΔP 低压涡轮后轴承腔室 exceeds the expected pressure range, increase the pressure of the oil pressure regulating tank; at this time, the gas turbine continues to operate at the same power, and the pressure is adjusted through the fine adjustment screw;

[0035] If the value of ΔP 低压涡轮后轴承腔室 is lower than the expected pressure range, reduce the pressure of the oil pressure regulating tank, and adjust the pressure through the fine adjustment screw or the coarse adjustment screw.

[0036] If the value of ΔP 低压涡轮后轴承腔室 still does not meet the expected pressure range after adjustment of the fine adjustment screw,

[0037] If the value of ΔP 低压涡轮后轴承腔室 exceeds the expected pressure range, stop the machine, reset the fine adjustment screw, adjust the coarse adjustment screw, start the gas turbine again, and make the value of ΔP 低压涡轮后轴承腔室 fall within the expected pressure range;

[0038] If the value of ΔP 低压涡轮后轴承腔室 is lower than the expected pressure range, do not move the fine adjustment screw, adjust the coarse adjustment screw after stopping the machine, start the gas turbine again, and continue until the value of ΔP 低压涡轮后轴承腔室 falls within the expected pressure range.

[0039] Each time the coarse adjustment screw is adjusted, it is rotated by half a turn.

[0040] The beneficial effects of this invention are as follows:

[0041] This invention is easy to operate. Through preliminary judgment and secondary adjustment, it regulates the lubricating oil pressure during the operation of the gas turbine, ensuring that the lubricating oil pressure of each bearing and lubricating oil chamber always meets the operating requirements, thus ensuring the stable operation of the gas turbine.

[0042] In this invention, the oil supply pressure is initially adjusted by fine-tuning. Then, under the premise of operating in the full power range, the pressure drop is calculated. By judging whether the pressure drop falls within the expected requirement range, the pressure in the lubricating oil pressure regulating box is adjusted again, thereby adjusting the sealing pressure drop of the lubricating oil chamber; thus ensuring the normal operation of the gas turbine. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the lubricating oil system structure of the present invention.

[0044] Figure 2 This is a flowchart illustrating the adjustment method of the present invention.

[0045] The components include: 1. Oil suction line for the turbine; 2. Oil return line for the turbine; 3. Oil pump; 4. Adjusting screw; 5. Main oil return line; 6. Main oil supply line; 7. Gas turbine body; 8. Oil return line for the rear bearing of the high-pressure compressor; 9. Oil return line for the rear bearing of the low-pressure turbine; 10. Oil pressure regulating box; 11. Oil pressure regulating line; 12. Fine adjustment screw; 13. Oil pressure regulating assembly; 14. Coarse adjustment screw; 15. Oil separator. Detailed Implementation

[0046] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0047] like Figure 1 As shown, the marine gas turbine lubrication system of this embodiment includes a lubrication pump 3, with a main oil supply line 6 and a main oil return line 5 leading out from the lubrication pump 3. The lubrication pump 3 is equipped with a lubrication adjustment screw 4.

[0048] Along the direction of lubricating oil flow, the main oil supply pipeline 6 is equipped with: gas turbine body 7, lubricating oil pressure regulating box 10, and lubricating oil pressure regulating assembly 13;

[0049] The gas turbine body 7 is connected to the lubricating oil pressure regulating box 10 by a high-pressure compressor rear bearing oil return line 8 and a low-pressure turbine rear bearing oil return line 9; the lubricating oil pressure regulating assembly 13 is equipped with a coarse adjustment screw 14 and a fine adjustment screw 12, and the lubricating oil output from the lubricating oil pressure regulating assembly 13 flows into the lubricating oil separator 15.

[0050] The lubricating oil separator 15 is connected to the return oil main line 5, and the lubricating oil flows back to the lubricating oil pump 3.

[0051] The gas turbine body 7 and the oil pressure regulating tank 10 are provided with return branch pipes which are connected to the oil return main pipe 5.

[0052] The oil return pump is provided with an engine belt oil suction pipe 1 and an engine belt oil return pipe 2.

[0053] As shown in Figure 2 the adjusting method of the marine gas turbine oil system of the embodiment comprises the following steps:

[0054] Step one: under the slow speed working condition, the relationship between the oil supply pressure and the oil supply range is judged;

[0055] Step two: if the oil supply pressure is less than the oil supply range, the adjusting screw 4 is rotated to increase the pressure until the oil supply pressure meets the expected requirement;

[0056] if the oil supply pressure is greater than the oil supply range, the adjusting screw 4 is rotated in the opposite direction to reduce the pressure until the oil supply pressure meets the expected requirement;

[0057] After the oil supply pressure meets the expectation, the gas turbine body 7 runs in the full power range, and the sealing pressure drop of the oil chamber at the high pressure compressor rear bearing and the low pressure turbine rear bearing is calculated by the following formula:

[0058] ΔP 高压后轴承腔室 =P 低压压气机 - P 高压压气机后轴承密封空气管路 - P 滑油压力调节箱 (1)

[0059] ΔP 低压涡轮后轴承腔室 =P 低压压气机 -P 低压涡轮后轴承密封空气管路 -P 滑油压力调节箱 (2)

[0060] In the formula:

[0061] ΔP 高压后轴承腔室 is the sealing pressure drop of the oil chamber at the high pressure compressor rear bearing,

[0062] P 低压压气机 is the static pressure measured at the low pressure compressor rear;

[0063] P 高压压气机后轴承密封空气管路 is the static pressure loss of the pipe through which air is sent from the low pressure compressor rear to the high pressure compressor rear bearing;

[0064] P 滑油压力调节箱 is the pressure of the oil pressure regulating tank;

[0065] ΔP 低压涡轮后轴承腔室 is the sealing pressure drop of the oil chamber at the low pressure turbine rear bearing;

[0066] P 低压涡轮后轴承密封空气管路Static pressure loss of the pipeline sending air from the low-pressure compressor rear to the low-pressure turbine rear bearing;

[0067] The above units are MPa; ΔP 高压后轴承腔室 , ΔP 低压涡轮后轴承腔室 The value range of each is required to fall in the same pressure range.

[0068] Step three: calculate the value of ΔP 低压涡轮后轴承腔室 of the gas turbine at 50% power, and determine whether the value falls in the expected pressure range; according to the size relationship between the value and the expected pressure range, adjust the oil pressure regulating assembly 13 so that the value of ΔP 低压涡轮后轴承腔室 of the gas turbine at 50% power falls in the expected pressure range.

[0069] ΔP 高压后轴承腔室 , ΔP 低压涡轮后轴承腔室的 The value range of each is required to fall in the range of 0-0.15 MPa.

[0070] In step three,

[0071] If the value of ΔP 低压涡轮后轴承腔室 exceeds the expected pressure range, increase the pressure of the oil pressure regulating tank 10; at this time, the gas turbine continues to operate at the same power, and the pressure is adjusted through the fine adjustment screw 12.

[0072] If the value of ΔP 低压涡轮后轴承腔室 is lower than the expected pressure range, reduce the pressure of the oil pressure regulating tank 10, and adjust the pressure through the fine adjustment screw 12 or the coarse adjustment screw rod 14.

[0073] If the value of ΔP 低压涡轮后轴承腔室 still does not meet the expected pressure range after the fine adjustment screw 12 is adjusted,

[0074] If the value of ΔP 低压涡轮后轴承腔室 exceeds the expected pressure range, stop the machine, reset the fine adjustment screw 12, adjust the coarse adjustment screw rod 14, start the gas turbine again, and make the value of ΔP 低压涡轮后轴承腔室 fall in the expected pressure range.

[0075] If the value of ΔP 低压涡轮后轴承腔室 is lower than the expected pressure range, do not move the fine adjustment screw 12, adjust the coarse adjustment screw rod 14 after stopping the machine, start the gas turbine again, and make the value of ΔP 低压涡轮后轴承腔室 fall in the expected pressure range.

[0076] Each time the coarse adjustment screw rod 14 is adjusted, it is rotated by 180 degrees.

[0077] One specific embodiment of the present application is as follows:

[0078] Step one, a gas turbine start to slow, the operator observed that the oil inlet pressure is 0.48 MPa, not in the slow speed condition of the oil pressure range 0.30-0.35 MPa, if not adjusted, the oil pressure will be higher than the full power interval, resulting in oil pressure loss, while the safe operation of the hidden trouble. Need to adjust the machine with the oil pump 3 adjustment screw 4 online.

[0079] Adjustment process: to reduce the oil pressure, screw out the adjustment screw 4, turn out half a circle. The oil inlet pressure from 0.48 MPa to 0.40 MPa, and then the oil pressure is stable at 0.40 MPa, then continue to turn out half a circle, and finally the oil pressure is stable at 0.34 MPa.

[0080] If the oil inlet pressure is less than 0.30 MPa, it should be adjusted by turning in the adjustment screw 4 online to increase the oil inlet pressure to greater than or equal to 0.30 MPa.

[0081] Step two, after the completion of the slow speed operation of the gas turbine, start the full power interval operation, through:

[0082] ΔP 高压后轴承腔室 =P 低压压气机 - P 高压压气机后轴承密封空气管路 - P 滑油压力调节箱 (1)

[0083] ΔP 低压涡轮后轴承腔室 =P 低压压气机 -P 低压涡轮后轴承密封空气管路 -P 滑油压力调节箱 (2)

[0084] The above two formulas are used to calculate the oil chamber seal pressure drop at the high pressure compressor rear bearing and the low pressure turbine rear bearing, to determine whether ΔP 低压涡轮后轴承腔室 and ΔP 高压后轴承腔室 are within the required range of 0-0.15 MPa.

[0085] Step three, through calculation, when the gas turbine body 7 runs at 50% power, ΔP 低压涡轮后轴承腔室 is 0.18 MPa, which exceeds the range value of 0-0.15 MPa, and the oil chamber seal pressure drop at the low pressure turbine rear bearing needs to be reduced, which requires increasing the pressure of the oil pressure regulating tank 10. At this time, the gas turbine continues to run at the same power, and the adjustment screw 12 is turned in to adjust ΔP 低压涡轮后轴承腔室 to 0.16 MPa, but it still exceeds the above range value and cannot meet the requirements.

[0086] But at this time, the adjustment limit of the fine adjustment screw 12 has been reached, and the machine is stopped; the fine adjustment screw 12 is returned to its original position, and the coarse adjustment screw 14 is turned out by half a circle. Then start the gas turbine again, and find that ΔP 低压涡轮后轴承腔室The oil pressure is 0.14 MPa, which falls within the expected range, and other power intervals also meet the operation requirements.

[0087] If it is necessary to increase the oil chamber sealing pressure drop ΔP of the high-pressure compressor rear bearing and the low-pressure turbine rear bearing 高压后轴承腔室 , ΔP 低压涡轮后轴承腔室 , the pressure of the oil pressure regulating tank 10 should be reduced, at which time the fine adjustment screw 12 should be unscrewed or the coarse adjustment screw 14 should be unscrewed to complete; the fine adjustment screw 12 can be adjusted on line, if the effect cannot be achieved, the gas turbine should be stopped, and then the coarse adjustment screw 14 is adjusted, and then the gas turbine is started, and whether the adjustment is continued is judged again according to the calculation of the oil chamber sealing pressure drop of the high-pressure compressor rear bearing and the low-pressure turbine rear bearing in the full working condition in step two.

[0088] In the adjustment process, the oil supply pressure, the pressure drop, and the pressure in the oil pressure regulating tank 10 are adjusted in sequence, the oil working state of the gas turbine body 7 is adjusted gradually, the oil pressure is quickly and accurately adjusted under the premise of minimizing the negative impact of the oil pressure on the gas turbine body 7, thereby ensuring the operation of the gas turbine body 7.

[0089] In the present application, the step-by-step investigation and step-by-step increase of the adjustment amount are adopted, which is convenient for finding the appropriate oil pressure value.

[0090] The above description is an explanation of the present application, not a limitation of the application, the scope of the present application is defined in the claims, within the protection scope of the present application, any form of modification can be made.

Claims

1. A marine gas turbine lubricating oil system characterized by: The lubricating oil pump (3) is provided with an oil supply main pipeline (6) and an oil return main pipeline (5), and is provided with a lubricating oil adjusting screw (4), The oil supply main pipeline (6) is provided with a gas turbine body (7), a lubricating oil pressure adjusting box (10) and a lubricating oil pressure adjusting assembly (13) along the lubricating oil flow direction; The gas turbine body (7) and the lubricating oil pressure adjusting box (10) are connected with a high-pressure compressor rear bearing oil return pipeline (8) and a low-pressure turbine rear bearing oil return pipeline (9); the lubricating oil pressure adjusting assembly (13) is provided with a coarse adjustment screw rod (14) and a fine adjustment screw (12), and the lubricating oil output by the lubricating oil pressure adjusting assembly (13) flows into a lubricating oil separator (15), The lubricating oil separator (15) is communicated with the oil return main pipeline (5), and the lubricating oil returns to the lubricating oil pump (3).

2. The marine gas turbine lubricating oil system of claim 1 wherein: The gas turbine body (7) and the lubricating oil pressure adjusting box (10) are both provided with a return branch, which is communicated to the oil return main pipeline (5).

3. The marine gas turbine lubricating oil system of claim 1 wherein: The oil pump is provided with a machine belt lubricating oil suction pipeline (1) and a machine belt lubricating oil return pipeline (2).

4. A method of adjusting a lubricating oil system of a marine gas turbine as defined in claim 1, characterized in that The method comprises the following steps: Step one: under the slow vehicle working condition, the relationship between the oil supply pressure and the oil supply range is judged; Step two: if the oil supply pressure is less than the oil supply range, the adjusting screw (4) is rotated to pressurize until the oil supply pressure of the lubricating oil meets the expected requirement; If the oil supply pressure is greater than the oil supply range, the adjusting screw (4) is reversely rotated to reduce the pressure until the oil supply pressure of the lubricating oil meets the expected requirement; After the oil supply pressure of the lubricating oil meets the expectation, the gas turbine body (7) is operated in the full power range, and the sealing pressure drop of the lubricating oil chamber at the high-pressure compressor rear bearing and the low-pressure turbine rear bearing is calculated by the following formula: ΔP 高压后轴承腔室 = P 低压压气机 - P 高压压气机后轴承密封空气管路 - P 滑油压力调节箱 (1) ΔP 低压涡轮后轴承腔室 = P 低压压气机 - P 低压涡轮后轴承密封空气管路 - P 滑油压力调节箱 (2) In the formula: ΔP 高压后轴承腔室 is the oil chamber seal pressure drop at the high-pressure compressor rear bearing, P 低压压气机 P is the static pressure measured after the low-pressure compressor; P 高压压气机后轴承密封空气管路 P = pressure loss in the pipe from the low pressure compressor rear to the high pressure compressor rear bearing feed P 滑油压力调节箱 P is the pressure of the lube oil pressure regulating tank; ΔP 低压涡轮后轴承腔室 is the oil sump seal pressure drop at the low pressure turbine aft bearing; P 低压涡轮后轴承密封空气管路 Static pressure losses in the ducts feeding air from the low pressure compressor aft to the low pressure turbine aft bearing; All the units are MPa; ΔP 高压后轴承腔室 , ΔP 低压涡轮后轴承腔室 The value ranges of ΔP and ΔP are required to fall within the same pressure range; Step three: calculate the value of ΔP of the gas turbine at 50% power, determine whether the value falls within the expected pressure range, and according to the size relationship between the value and the expected pressure range, adjust the lubricating oil pressure adjusting assembly (13) to make the value of ΔP of the gas turbine at 50% power fall within the expected pressure range. 低压涡轮后轴承腔室 Step three: calculate the value of ΔP of the gas turbine at 50% power, determine whether the value falls within the expected pressure range, and according to the size relationship between the value and the expected pressure range, adjust the lubricating oil pressure adjusting assembly (13) to make the value of ΔP of the gas turbine at 50% power fall within the expected pressure range. 低压涡轮后轴承腔室 Step three: calculate the value of ΔP of the gas turbine at 50% power, determine whether the value falls within the expected pressure range, and according to the size relationship between the 5. The method of adjusting a marine gas turbine lubricating oil system of claim 4 wherein: ΔP 高压后轴承腔室 , ΔP 低压涡轮后轴承腔室 The value range of ΔP is required to fall within 0-0.15 MPa.

6. The method of adjusting a marine gas turbine lubricating oil system of claim 4 wherein: In step three, If the value of ΔP 低压涡轮后轴承腔室 is outside the expected pressure range, the oil pressure of the oil pressure regulating tank (10) is increased, and the gas turbine continues to operate at the same power, and the pressure is adjusted by the fine adjustment screw (12). If the value of ΔP 低压涡轮后轴承腔室 is below the expected pressure range, the oil pressure of the oil pressure regulating tank (10) is reduced, and the pressure is regulated by the fine adjustment screw (12) or the coarse adjustment screw (14).

7. The method of adjusting a marine gas turbine lubricating oil system of claim 6 wherein: If, after adjustment of the fine adjustment screw (12), the value of ΔP 低压涡轮后轴承腔室 still does not lie within the desired pressure range, ΔP 低压涡轮后轴承腔室 When the value of ΔP exceeds the expected pressure range, the gas turbine is shut down, the fine adjustment screw (12) is reset, the coarse adjustment screw (14) is adjusted, and the gas turbine is started again, bringing the value of ΔP within the expected pressure range. 低压涡轮后轴承腔室 When the value of ΔP exceeds the expected pressure range, the gas turbine is shut down, the fine adjustment screw (12) is reset, the coarse adjustment screw (14) is adjusted, and the gas turbine is started again, bringing the value of ΔP within the expected pressure range. ΔP 低压涡轮后轴承腔室 If the value of ΔP is below the expected pressure range, the fine adjustment screw (12) is not moved, the coarse adjustment screw (14) is adjusted after shutdown, the gas turbine is started again and the value of ΔP is checked until the value of ΔP 低压涡轮后轴承腔室 falls into the expected pressure range.

8. The method of adjusting a marine gas turbine lubricating oil system of claim 7 wherein: The coarse adjustment screw rod (14) is rotated by half a circle each time.

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