Gas turbine lubricating oil consumption measuring method and used device

Abstract

The invention relates to a gas turbine lubricating oil consumption measuring method and device, and belongs to the field of gas turbines, and the measuring device is composed of a liquid level balancing system and a weighing oil supplementing system. The lubricating oil liquid level height scale before the gas turbine runs is determined through the liquid level balance system, and after the gas turbine runs, the lubricating oil liquid level is restored to the scale before running through the oil supplementing system. At the moment, the reduced lubricating oil mass of the oil supplementing system is the lubricating oil consumption of the gas turbine in the period of time. The method is accurate and easy and convenient to operate, is applied to calculation of the delivery test lubricating oil consumption of multiple gas turbines, and has important significance on development and stable operation of the gas turbines.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and in particular to a method for measuring the lubricating oil consumption of a gas turbine and a device used therefor. Background Art

[0002] During the operation of a gas turbine, the lubricating oil system is an important part to ensure its normal operation. The lubricating oil not only plays a lubricating role, but also undertakes the functions of cooling and cleaning. During the operation of the gas turbine, it is necessary to calculate the lubricating oil consumption rate to determine whether it meets the design value.

[0003] Currently, the consumption of the lubricating oil of a gas turbine is generally calculated and determined based on the change in the liquid level of the lubricating oil tank. However, during the factory stage of the gas turbine, the running hours are short, the cross-sectional area of the lubricating oil tank is large, and the decrease in the liquid level of the lubricating oil tank caused by the consumption of the lubricating oil is small. Measuring the lubricating oil consumption in this case is not accurate enough. Summary of the Invention

[0004] The applicant of the present invention aims at the above-mentioned disadvantages in the existing production technology, and provides a method for measuring the lubricating oil consumption of a gas turbine and a device used therefor. By weighing the replenishing oil amount after each operation consumption and obtaining the ratio of the replenishing oil amount to the time, the accurate lubricating oil consumption rate can be obtained.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A method for measuring the lubricating oil consumption of a gas turbine, the gas turbine is intermittently operated, lubricating oil is replenished from a weighing tank into the lubricating oil tank with intermittent oil consumption, the weight of the weighing tank after each replenishment of oil is weighed to obtain the single replenishment oil mass, and the ratio of the single replenishment oil mass to the operation interval time of the gas turbine is the lubricating oil consumption rate.

[0007] As a further improvement of the above technical solution:

[0008] The specific steps are as follows:

[0009] Step 1: Close all valves in the system, add oil to the lubricating oil tank to the expected liquid level height, perform cold blowing on the gas turbine, and after the cold blowing is completed, close the lubricating oil return oil pump.

[0010] Step 2: Connect the lubricating oil tank and the liquid level control tank to make the liquid levels of the lubricating oil tank and the liquid level control tank flush; adjust the height of the liquid level control tank to leave a liquid level spacing between the float ball valve built in the liquid level control tank and the current liquid level.

[0011] Step 3: Connect the liquid level control tank and the weighing tank, and the weighing tank replenishes lubricating oil into the liquid level control tank until the float ball valve closes, and record the mass of the weighing tank at this time.

[0012] Step 4: Close all valves within the system. After the gas turbine operates for the specified time, shut it down. After the lubricating oil return pump is closed, connect the lubricating oil tank, the liquid level control box, and the weighing box, and continue to replenish oil until the float valve closes. Record the mass of the weighing box at this time.

[0013] Step 5: The ratio of the difference between the masses of the weighing box in two measurements to the operating interval time of the gas turbine is denoted as the lubricating oil consumption rate.

[0014] In Step 1, after the cold blow of the gas turbine is completed, the lubricating oil circulation is finished, the circulating lubricating oil inside the unit is pumped back to the tank, and the lubricating oil return pump is closed as per the regulations.

[0015] In Step 2, adjust the height adjustment platform at the bottom of the liquid level control box to make the height of the float valve higher than the current liquid level inside the liquid level control box.

[0016] In Step 3 and Step 4, the mass of the weighing box is measured in real time by an electronic scale.

[0017] A measuring device for a method of measuring the lubricating oil consumption of a gas turbine includes a liquid level balance system and a weighing and oil replenishing system that are interconnected.

[0018] The liquid level balance system includes a liquid level control box with a built-in float valve. The weighing and oil replenishing system includes a weighing box and an electronic scale at the bottom of the weighing box. The lubricating oil tank, the liquid level control box, and the weighing box are connected by pipelines.

[0019] The beneficial effects of the present invention are as follows:

[0020] The present invention uses a weighing and metering method to replace the method of measuring the liquid level change in the prior art. The metering is more accurate and the operation is simple. It has been applied to the calculation of the lubricating oil consumption in the factory tests of multiple gas turbines, which is of great significance for the development and stable operation of gas turbines.

[0021] The present invention determines the scale of the lubricating oil liquid level before the operation of the gas turbine through the liquid level balance system. After the gas turbine operates, the lubricating oil liquid level is restored to the scale before operation through the oil replenishing system. At this time, the reduced mass of the lubricating oil in the oil replenishing system is the lubricating oil consumption of the gas turbine during this period. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the system used for the measuring method of the present invention.

[0023] Wherein: 1. Lubricating oil supply pump; 2. Lubricating oil return pump; 3. Lubricating oil tank; 4. Lubricating oil level; 5. Electric heater; 6. First valve; 7. Connecting pipe; 8. Second valve; 9. Liquid level control box; 10. Float valve; 11. Third valve; 12. Liquid supplement pipe; 13. Fourth valve; 14. Weighing box; 15. Electronic scale; 16. Weighing box support; 17. Liquid level control box support; 18. Height adjustment platform; 19. Oil tank support; 20. Thermal resistor. Specific embodiments

[0024] The following combines with the attached drawings to illustrate the specific embodiments of the present invention.

[0025] The present invention uses Figure 1 the device in

[0026] As Figure 1 shown, a support is provided at the bottom of the lubricating oil tank 3, and a thermal resistor 20 and an internal electric heater 5 are also provided on the lubricating oil tank 3. The lubricating oil tank 3 is equipped with a lubricating oil return pump 2 and a lubricating oil supply pump 1, which respectively supply lubricating oil to the lubricating oil tank 3 and supply lubricating oil to the gas turbine.

[0027] The lubricating oil level in the lubricating oil tank 3 fluctuates, and the lubricating oil level reflects the fuel consumption of the gas turbine. Therefore, accurate measurement is required. The present invention connects a liquid level control box 9 and a weighing box 14 to the side of the lubricating oil tank 3, converts the liquid level change of the lubricating oil tank 3 into the weight change of the weighing box 14, and makes the statistical measurement of lubricating oil fuel consumption more intuitive and accurate.

[0028] A connecting pipe 7 is led out from the side wall of the lubricating oil tank 3. A first valve 6 is provided on the connecting pipe 7 near the lubricating oil tank 3, and a second valve 8 is provided on the connecting pipe 7 near the liquid level control box 9.

[0029] The liquid level control box 9 is internally provided with a float valve 10. The float valve 10 is used to keep the liquid level in the liquid level control box 9 within the expected range. When the liquid level rises to the expected liquid level, the float valve 10 closes.

[0030] A liquid supplement pipe 12 is connected between the liquid level control box 9 and the weighing box 14. A third valve 11 is connected between the liquid supplement pipe 12 and the liquid level control box 9, and a fourth valve 13 is connected between the liquid supplement pipe 12 and the weighing box 14. Each valve can be opened and closed independently.

[0031] Among them, a height adjustment platform 18 is provided at the bottom of the liquid level control box 9, and an electronic scale 15 is provided at the bottom of the weighing box 14. Brackets are provided at the bottoms of the lubricating oil tank 3, the liquid level control box 9, and the weighing box 14, namely the oil tank bracket 19, the liquid level control box bracket 17, and the weighing box bracket 16. The heights of these brackets increase in sequence to form a gradient support structure, which facilitates the self-weight refueling of the lubricating oil in the weighing box 14. The function of the liquid level control box bracket 17 is to make the liquid level height in the liquid level control box 9 flush with the liquid level height in the lubricating oil tank 3.

[0032] As another alternative implementation manner, in this embodiment, the liquid level control box 9 can be changed to a single box body, and the float valve 10 is no longer provided inside to control the liquid level. That is, between the lubricating oil tank 3 and the weighing box 14, a connecting oil circuit equivalent to a U-shaped tube is formed through pipelines and box bodies, and the step of adjusting the liquid level is omitted.

[0033] On the basis of the first implementation manner, an electronic scale is added between the box body and the height adjustment platform. The change in the amount of oil in the box body is obtained through the electronic scale, that is: the original float valve is used to measure the liquid level, and now the electronic scale is used to measure the weight, so as to obtain the change in the amount of oil.

[0034] The method for measuring the lubricating oil consumption of a gas turbine is as follows:

[0035] Step 1: The first valve 6, the second valve 8, the third valve 11, and the fourth valve 13 are all in the closed state. Lubricating oil is filled into the lubricating oil tank 3 to the specified liquid level height; cold blowing of the gas turbine is carried out, and after the cold blowing is completed and the lubricating oil return pump is closed.

[0036] Step 2: Open the first valve 6 and the second valve 8 to make the lubricating oil in the lubricating oil tank 3 flow into the liquid level control box 9 and wait for the liquid surface to balance. Adjust the height of the height adjustment platform 18 so that the height of the float valve 10 is slightly higher than the current liquid level.

[0037] Step 3: Open the fourth valve 13 and the third valve 11 to add lubricating oil into the weighing box 14; the lubricating oil enters the inside of the liquid level control box 9 and the lubricating oil tank 3 through the liquid replenishing pipe 12 until the float valve closes. Record the mass m of the weighing box 14 measured by the high-precision electronic scale 15 at this time 1 .

[0038] Step 4: Close the third valve 11 and the fourth valve 13. After the gas turbine starts running for the specified running time t, it shuts down. After shutting down, wait for the return pump to close, open the third valve 11 and the fourth valve 13, and the lubricating oil enters the inside of the liquid level control box 9 and the lubricating oil tank 3 through the liquid replenishing pipe 12 until the float valve closes. Record the mass m of the weighing box 14 measured by the high-precision electronic scale 15 at this time 2 .

[0039] Step 5: Calculate the lubricating oil consumption rate

[0040] The lubricating oil consumption rate is calculated using the following formula:

[0041] Q = (m 1 - m 2 ) / t

[0042] Where: Q—the lubricating oil consumption rate, kg / h;

[0043] t—the operating interval time of the gas turbine, h.

[0044] The following takes an out-of-factory gas turbine as an example for specific operation instructions.

[0045] A certain gas turbine has completed the installation on the test bench and is subsequently ready for the out-of-factory test. The determination of the lubricating oil consumption is achieved through the following steps.

[0046] Step 1: The first valve 6, the second valve 8, the third valve 11, and the fourth valve 13 are all in the closed state. Lubricating oil is filled into the lubricating oil tank 3 to the specified liquid level height. The visible liquid level gauge of the lubricating oil tank shows that the liquid level is approximately 750 cm, meeting the specified requirement value of 700 - 750 cm; before the test, the gas turbine is cold-blown to fill the lubricating oil system pipeline of the gas turbine with lubricating oil. Then, after the cold-blowing ends and until the return oil pump for the lubricating oil circulation is closed.

[0047] Step 2: Open the first valve 6 and the second valve 8 to allow the lubricating oil in the lubricating oil tank 3 to flow into the liquid level control tank 9 and wait for the liquid level to balance. Adjust the height of the height adjustment platform 18 so that the height of the float valve 10 is slightly higher than the current liquid level.

[0048] Step 3: Open the fourth valve 13 and the third valve 11 to add lubricating oil into the weighing tank 14; the lubricating oil enters the inside of the liquid level control tank 9 and the lubricating oil tank 3 through the liquid supply pipe 12 until the float valve closes. Record the mass g of the weighing tank 14 measured by the high-precision electronic scale 15 at this time.

[0049] Step 4: Close the third valve 11 and the fourth valve 13. The gas turbine starts to conduct the out-of-factory test as specified and stops after running for 4 hours and 30 minutes. After stopping, wait for the return oil pump to close, then open the third valve 11 and the fourth valve 13. The lubricating oil enters the inside of the liquid level control tank 9 and the lubricating oil tank 3 through the liquid supply pipe 12 until the float valve closes. Record the mass 3157.25 g of the weighing tank 14 measured by the high-precision electronic scale 15 at this time.

[0050] Step 5: Calculate the lubricating oil consumption rate

[0051] The lubricating oil consumption rate is calculated using the following formula:

[0052] Q = (m 1 - m 2) / t = (5012.38 - 3157.25) × 10 -3 kg / (4.5 h)

[0053] = 0.41225 kg / h

[0054] Where: Q—the lubricating oil consumption rate, kg / h;

[0055] t—the operating interval time of the gas turbine, h.

[0056] It should be noted that: the lubricating oil temperatures in Step 3 and Step 4 are kept consistent, both being 40 °C, meeting the specified value in the operation specification.

[0057] Therefore, the lubricating oil consumption rate of this gas turbine is 0.41225 kg / h, meeting the index requirement of ≤ 0.5 kg / h.

[0058] The above description is an explanation of the present invention, not a limitation thereof. For the scope defined by the present invention, refer to the claims. Any form of modification may be made within the protection scope of the present invention.

Claims

1. A method for measuring lubricating oil consumption of a gas turbine, characterized in that: When the gas turbine is operated intermittently, lubricating oil is added to the lubricating oil tank (3) which is intermittently consuming oil from the weighing box (14). The weight of the weighing box (14) after each oil replenishment is weighed to obtain the mass of the single oil replenishment. The ratio of the mass of the single oil replenishment to the interval time of the gas turbine operation is the lubricating oil consumption rate.

2. The method for measuring lubricating oil consumption of a gas turbine according to claim 1, characterized in that: The specific steps are as follows: Step 1: Close all valves in the system, add oil to the lubricating oil tank (3) to the expected liquid level, and perform cold blowing of the gas turbine. After the cold blowing is completed, close the lubricating oil return pump (2). Step 2: connect the lubricating oil tank (3) and the liquid level control box (9) so that the liquid levels of the lubricating oil tank (3) and the liquid level control box (9) are flush; adjust the height of the liquid level control box (9) so that a liquid level gap is reserved between the float valve (10) built into the liquid level control box (9) and the current liquid level. Step 3: Connect the liquid level control box (9) and the weighing box (14), and the weighing box (14) replenishes lubricating oil into the liquid level control box (9) until the float valve (10) is closed, and record the mass of the weighing box (14) at this time. Step 4: Close all valves in the system, and shut down the gas turbine after running for a specified time. After the lubricating oil return pump (2) is turned off, connect the lubricating oil tank (3), the liquid level control box (9) and the weighing box (14), and add oil until the float valve (10) is closed. Record the mass of the weighing box (14) at this time. Step 5: The ratio of the difference between the two weighing boxes (14) masses and the gas turbine operation interval time is recorded as the lubricating oil consumption rate.

3. The method for measuring the lubricating oil consumption of a gas turbine according to claim 2, characterized in that: In step 1, the gas turbine cold blow is completed, the lubricating oil circulation is completed, the lubricating oil circulating inside the unit is pumped back to the oil tank, and the lubricating oil return pump (2) is closed as required.

4. The method for measuring the lubricating oil consumption of a gas turbine according to claim 2, characterized in that: In step 2, the height adjustment platform (18) at the bottom of the liquid level control box (9) is adjusted so that the height of the float valve (10) is higher than the current liquid level in the liquid level control box (9).

5. The method for measuring the lubricating oil consumption of a gas turbine according to claim 2, characterized in that: In step 3 and step 4, the mass of the weighing box (14) is measured in real time by an electronic scale (15).

6. A measuring device for the gas turbine lubricating oil consumption measuring method according to claim 1, characterized in that: Including interconnected liquid level balance system and weighing oil replenishment system, The liquid level balance system comprises a liquid level control box (9) with a built-in float valve (10), the weighing and oil replenishing system comprises a weighing box (14) and an electronic scale (15) located at the bottom of the weighing box (14), and the lubricating oil tank (3), the liquid level control box (9) and the weighing box (14) are connected by pipelines.

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