Method for determining repair time of marine gas turbine according to parameters of gas compressor

Abstract

The invention relates to a method for determining the repair opportunity of a marine gas turbine according to parameters of a gas compressor, which is based on a full-life examination test carried out during the development period of the gas turbine, and is used for determining the repair opportunity of the marine gas turbine before and after the test (after the full-life graph examination test is completed and the gas turbine is subjected to through-flow cleaning) and under the output rated power (modified value) of the gas turbine. The change of the rotation speed correction value of the high-pressure compressor and the change of the rear air pressure correction value of the high-pressure compressor serve as repair judgment basis values. For a specific gas turbine of the type of gas turbine, when a test is delivered, after the gas turbine runs for a period of time and through-flow cleaning is carried out, the rotation speed correction value of the high-pressure compressor and the air pressure correction value behind the high-pressure compressor change, and when the change value is larger than or equal to the repair judgment basis value, repair should be carried out.

Description

Technical Field

[0001] The invention relates to the technical field of gas turbines, and in particular to a method for determining a repair time of a marine gas turbine according to compressor parameters. Background Art

[0002] Gas turbines are widely used in fields such as ship power and offshore oil platform power generation due to their compact structural layout, good fuel economy indicators, high thermal efficiency, good reliability and long service life, becoming the core power representative of the new generation.

[0003] In actual use, the power output of marine gas turbines is quite different from that of land-based gas turbines. Land-based gas turbines have a longer continuous use time and less load changes. For example, gas turbines used in power plants continuously output power at full load and do not stop for several months. Marine gas turbines have different use time and load according to different use conditions such as anchoring, docking, and sailing, and there are many variable working conditions in the actual operation process.

[0004] There are no clear regulations on the evaluation of the life of marine gas turbines during use and the determination of the timing of return and repair, and the life of marine gas turbines is easily affected by variable operating conditions. If a gas turbine fails due to over-life operation, it will cause great harm. How to determine the timing of returning to the factory for repair after a period of use is crucial. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a method for determining the repair timing of a marine gas turbine based on the changes in compressor parameters under the same output power.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A method for determining the repair timing of a marine gas turbine based on compressor parameters. The repair timing of the gas turbine is determined by the speed difference of the high-pressure compressor before and after the full life spectrum assessment test, or the rear air pressure difference of the high-pressure compressor before and after the full life spectrum assessment test.

[0008] The steps include:

[0009] Step 1: Perform a full life map test on the gas turbine. Before the test, after the test and after the flow cleaning, the gas turbine is operated according to the expected operating conditions.

[0010] Step 2: Correct the operating parameters of the gas turbine in step 1. The actual power obtained under each operating condition before and after the test is recorded as W 试验前 , W 试验完成后 , W 试验前, W 试验完成后 The atmospheric parameters and output shaft characteristics are corrected to obtain the power correction value before and after the test, recorded as W 试验前修正值 , W 试验完成后修正值 ,

[0011] The high pressure compressor speed at each operating condition before and after the test is recorded as N 2试验前 、N 2试验完成后 , N 2试验前 、N 2试验完成后 Correct the atmospheric conditions, total intake pressure loss and exhaust static pressure loss to obtain the high-pressure compressor speed correction value before and after the test, recorded as N 2试验前修正值 、N 2试验完成后修 At the time,

[0012] According to the relationship between the high pressure compressor speed correction value and the power correction value before and after the test, the rated operating power correction value is obtained, which is recorded as W 1.0工况修正值 , and the corresponding high pressure compressor speed correction value before and after the test, denoted as N 2试验前1.0工况修正值 、N 2试验完成后1.0工况修正值 ,

[0013] Step 3: The numerical difference between the high-pressure compressor speed correction value before and after the test in step 2 is used as the speed reference for repair.

[0014] In step 2, the high pressure compressor speed correction formula is as follows:

[0015]

[0016] Where N 2实测值 To measure the high pressure compressor rotor speed,

[0017] N 2修正值 To correct the speed to the specified reference atmospheric conditions and intake and exhaust resistance loss deviation,

[0018] T 实测值 To measure the atmospheric temperature,

[0019] D′ i , D″ i They are intake resistance loss and exhaust resistance loss deviation correction coefficients respectively.

[0020] In step 3, the numerical difference between the high pressure compressor speed correction value before and after the test is recorded as: ΔN2, ΔN2 = N 2试验完成后1.0工况修正值 -N 2试验前1.0工况修正值 .

[0021] The steps include:

[0022] Step 1: Perform a full life map test on the gas turbine. Before and after the test (after flow cleaning), the gas turbine is operated according to the expected operating conditions.

[0023] Step 2: Correct the operating parameters of the gas turbine in step 1. The actual power obtained under each operating condition before and after the test is recorded as W 试验前 , W 试验完成后 , W 试验前 , W 试验完成后 The atmospheric parameters and output shaft characteristics are corrected to obtain the power correction value before and after the test, recorded as W 试验前修正值 , W 试验完成后修正值 ,

[0024] The air pressure after the high pressure compressor of each working condition before and after the test is recorded as P 2试验前 , P 2试验完成后 , the atmospheric conditions, total intake pressure loss and exhaust static pressure loss are corrected to obtain the corrected value of the air pressure after the high-pressure compressor before and after the test, recorded as P 2试验前修正值 , P 2试验完成后修正值 According to the relationship between the air pressure correction value after the high pressure compressor and the power correction value before and after the test, the rated operating power correction value is obtained, which is recorded as W 1.0工况修正值 , and the corresponding correction value of the air pressure after the high pressure compressor before and after the test, recorded as P 2试验前1.0工况修正值 , P 2试验完成后1.0工况 Correction value,

[0025] Step 3: The difference between the corrected values ​​of the air pressure behind the high-pressure compressor before and after the test in step 2 is used as the reference of the air pressure behind the high-pressure compressor when the repair is in progress.

[0026] In step 2, the correction formula for the air pressure correction value after the high-pressure compressor is as follows:

[0027]

[0028] Where P 2实测值 To measure the air pressure after the high pressure compressor,

[0029] P 2修正值 The air pressure after the high pressure compressor is corrected to the specified reference atmospheric conditions and the intake and exhaust resistance losses.

[0030] ∈1, ∈2 are intake resistance loss and exhaust resistance loss deviation correction coefficients respectively.

[0031] In step 3, the difference in the value of the air pressure correction value after the high-pressure compressor before and after the test is recorded as ΔP2, ΔP2 = P 2试验完成后1.0工况修正值 -P 2试验前1.0工况修正值 .

[0032] In step 2, the power correction formula is as follows:

[0033]

[0034] Where W 实测值 is the measured power value,

[0035] P 实测值 To measure the atmospheric pressure,

[0036] T 实测值 To measure the atmospheric temperature,

[0037] P0 is standard atmospheric pressure,

[0038] T0 is the standard atmospheric temperature,

[0039] θ1 and θ2 are the propeller characteristic correction coefficient and the power turbine relative speed correction coefficient respectively.

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

[0041] The present invention discloses a method for determining the repair timing of a marine gas turbine based on compressor parameters. The method is based on a full life assessment test conducted during the development of the gas turbine. Before and after the test (after completing the full life spectrum assessment test and performing gas turbine flow cleaning), the changes in compressor parameters at the rated power (corrected value) of the gas turbine output are used as the basis for repair judgment.

[0042] After the gas turbine completes the full life assessment test, the performance of various hot components such as the turbine, combustion chamber, and compressor performance will all decline, and various thermal parameters will change accordingly after the performance declines. The present invention uses water cleaning to restore the performance decline of the compressor caused by flow dirt. At the same rated power output, after the full life test compared to before the test, due to the decline in the performance of the turbine, combustion chamber, etc., the compressor pressure and speed parameters will increase (because of performance decline, only when the compressor output increases can the same power be output). The increase value is used as the basis for the timing of repair. When the compressor parameters of a certain gas turbine of this type exceed the above-mentioned repair judgment basis value, it should be repaired. The method has clear logic and is of great significance for judging the timing of gas turbine repairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is the work flow chart of the present invention.

[0044] Figure 2 This is a relationship diagram between the high-pressure compressor speed correction value and the power correction value before and after the full life test in the present invention.

[0045] Figure 3This is a relationship diagram between the air pressure correction value and the power correction value after the high-pressure compressor before and after the full life test in the present invention. DETAILED DESCRIPTION

[0046] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0047] The workflow of the present invention refers to Figure 1 The working background is: before the gas turbine is officially put into use, a full life test must be carried out. On this basis, the present invention obtains some parameters and corrects them, and obtains the time node of equipment overhaul through simple calculation.

[0048] Step 1: The gas turbine full life spectrum assessment test before the test and after the test (after the gas turbine flow cleaning) are used as two operating nodes. At each operating node, the gas turbine is operated at 10% of the rated power as one gear and at all gears above 50% of the rated power.

[0049] Step 2: Correct the parameters of each operating condition before and after the full life spectrum assessment test in step 1. For the convenience of reading and writing, the full life spectrum assessment test is referred to as the test below.

[0050] The actual power obtained under each working condition before and after the test is recorded as W 试验前 , W 试验完成后 , W 试验前 , W 试验完成后 The atmospheric parameters and output shaft characteristics are corrected to obtain the power correction value before and after the test, recorded as W 试验前修正值 , W 试验完成后修正值 The correction formula is as follows:

[0051]

[0052] Where W 实测值 , P 实测值 、T 实测值 They are respectively the measured power value, unit kW; the measured atmospheric pressure value, unit pa; the measured atmospheric temperature, unit K; P0 is the standard atmospheric pressure 101300 pa, T0 is the standard atmospheric temperature 300.15 K; θ1, θ 2分别为 Propeller characteristic correction factor, power turbine relative speed correction factor.

[0053] For details on the correction method, please refer to the Ship Industry Standard of the People's Republic of China "Data Processing Method for Thermal Performance Test of Ship Gas Turbines" (CB 20429-2018).

[0054] The high pressure compressor speed at each operating condition before and after the test is recorded as N 2试验前 、N2试验完成后 , N 2试验前 、N 2试验完成后 Correct the atmospheric conditions, total intake pressure loss and exhaust static pressure loss to obtain the high-pressure compressor speed correction value before and after the test, recorded as N 2试验前修正值 、N 2试验完成后修正值 The correction formula is as follows:

[0055]

[0056] Where N 2实测值 、N 2修正值 They are respectively the measured high-pressure compressor rotor speed, the speed corrected to the specified reference atmospheric conditions, and the speed corrected for the intake and exhaust resistance loss deviation, in r / min; T 实测值 is the measured atmospheric temperature, unit K; D′ i , D″ i They are intake resistance loss and exhaust resistance loss deviation correction coefficients respectively.

[0057] According to the relationship between the high-pressure compressor speed correction value and the power correction value before and after the test, the power correction value under the 1.0 condition is obtained, that is, the rated condition correction value, which is recorded as W 1.0工况修正值 The corresponding high pressure compressor speed correction value before and after the test is recorded as N 2试验前1.0工况修正值 、N 2试验完成后1.0工况修正值 .

[0058] The relationship between the high-pressure compressor speed correction value and the power correction value before and after the test is as follows: Figure 2 The converted value in the figure is the corrected value.

[0059] The air pressure after the high pressure compressor of each working condition before and after the test is recorded as P 2试验前 , P 2试验完成后 , P 2试验前 , P 2试验完成后 The atmospheric conditions, total intake pressure loss and exhaust static pressure loss are corrected to obtain the corrected value of the air pressure after the high-pressure compressor before and after the test, which is recorded as P 2试验前修正值 , P 2试验完成后修正值 The correction formula is as follows:

[0060]

[0061] Where P 2实测值 , P 2修正值 They are respectively the measured air pressure after the high-pressure compressor and the air pressure after the high-pressure compressor is corrected to the specified reference atmospheric conditions and the intake and exhaust resistance losses, in units of pa; ∈1 and ∈2 are the intake resistance loss and exhaust resistance loss deviation correction coefficients, respectively.

[0062] According to the relationship between the air pressure correction value after the high pressure compressor and the power correction value before and after the test, the power correction value under the working condition of 1.0 is obtained, that is, the rated working condition correction value, which is recorded as W 1.0工况修正值 ; and the corresponding correction value of the air pressure after the high pressure compressor before and after the test, denoted as P 2试验前1.0工况修正值 , P 2试验完成后1.0工况修正值 .

[0063] The relationship between the air pressure correction value after the high-pressure compressor and the power correction value before and after the test is as follows: Figure 3 shown.

[0064] Step 3: The numerical difference between the high-pressure compressor speed correction values ​​before and after the test obtained in step 2 is used as the speed reference for the repair timing, denoted as ΔN2, ΔN2 = N 2试验完成后1.0工况修正值 -N 2试验前1.0工况 Correction value.

[0065] The numerical difference of the air pressure correction value after the high-pressure compressor before and after the test is used as the air pressure reference after the high-pressure compressor at the time of repair, denoted as ΔP2, ΔP2 = P 2试验完成后1.0工况修正值 -P 2试验前1.0工况修 Right.

[0066] If any of the above two repair timing criteria is met, repair is required.

[0067] The specific process of applying the above method to the gas turbine of a real ship is as follows:

[0068] During the factory delivery test, the gas turbine of this type was operated at actual power at each gear of 10% of the rated power and above 50% of the rated power;

[0069] After the gas turbine has been running for a period of time t, the gas turbine is flow-cleaned. After cleaning, the gas turbine is operated at actual power at a level of 10% of the rated power and at various levels above 50% of the rated power.

[0070] The actual power obtained under various operating conditions during the delivery test and after a period of operation for gas turbine flow cleaning is corrected for atmospheric parameters and output shaft characteristics. The actual power is recorded as: W 交付试验 , W 运行一段时间进行燃气轮机通流清洗后 , the corrected power correction value is recorded as: W 交付试验修正值 , W 运行一段时间进行燃气轮机通流清洗后修正值 .

[0071] The high-pressure compressor speed at each operating condition during the delivery test and after a period of operation for gas turbine flow cleaning is corrected for atmospheric conditions, total intake pressure loss and exhaust static pressure loss. The high-pressure compressor speed is recorded as: N 2交付试验 、N 2运行一段时间进行燃气轮机通流清洗后, the corrected high pressure compressor speed correction value is recorded as: N 2交付试验修正值 、N 2运行一段时间进行燃气轮机通流清洗后修正值 .

[0072] According to the relationship between the high-pressure compressor speed correction value and the power correction value during the delivery test and after the gas turbine is cleaned for a period of operation, the power correction value under the 1.0 condition is obtained, that is, the rated condition power correction value, which is recorded as W 1.0工况修正值 , and the corresponding high-pressure compressor speed correction value during delivery test and after running for a period of time for gas turbine flow cleaning, are recorded as: N 2交付试验1.0工况修正值 、N 2运行一段时间进行燃气轮机通流清洗后1.0工况修正值 .

[0073] When N 2运行一段时间进行燃气轮机通流清洗后1.0工况修正值 -N 2交付试验1.0工况修正值 If ≥ΔN2, the machine should be returned to the factory for repair. Figure 2 Take the curve as an example, N 2试验完成后1.0工况修正值 is 0.9705, N 2试验前1.0工况修正值 is 0.9647, ΔN2=0.9705-0.9647=0.0058, that is, N 2运行一段时间进行燃气轮机通流清洗后1.0工况修正值 -N 2交付试验1.0工况修正值 When ≥0.0058, the product should be returned to the factory for repair.

[0074] As another available method, the air pressure after the high-pressure compressor can also be used as a factor to determine whether an overhaul is required. The implementation process is as follows:

[0075] The air pressure after the high-pressure compressor at each operating condition at the time of delivery test and after the gas turbine is cleaned after running for a period of time is corrected for atmospheric conditions, total intake pressure loss and exhaust static pressure loss. The air pressure after the high-pressure compressor before correction is recorded as: P 2交付试验 , P 2运行一段时间进行燃气轮机通流清洗后 , the corrected values ​​of the air pressure after the high pressure compressor are recorded as: P 2交付试验修正值 , P 2运行一段时间进行燃气轮机通流清洗后修正值 .

[0076] According to the relationship between the air pressure correction value after the high-pressure compressor and the power correction value after the gas turbine is cleaned during the delivery test and after running for a period of time, the power correction value under the working condition of 1.0 is obtained, that is, the rated working condition power correction value, which is recorded as: W 1.0工况修正值 , and the corresponding delivery test, the air pressure correction value after the high pressure compressor after the gas turbine is cleaned after running for a period of time, recorded as: P 2交付试验1.0工况修正值 , P 2运行一段时间进行燃气轮机通流清洗后1.0工况修正值 .

[0077] When P 2运行一段时间进行燃气轮机通流清洗后1.0工况修正值 -P 2交付试验1.0工况修正值 When ≥ΔP2, the gas turbine should be returned to the factory for inspection and repair. Figure 3 Take the curve in as an example, P 2试验前1.0工况修正值is 0.9593, P 2试验完成后1.0工况修正值 is 0.9622, ΔP2=0.9622-0.9593=0.0029. That is, P 2运行一段时间进行燃气轮机通流清洗后1.0工况修正值 -P 2交付试验1.0工况修正值 When ≥0.0029, the gas turbine should be returned to the factory for inspection and maintenance.

[0078] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A method for determining the repair time of a marine gas turbine based on compressor parameters, characterized in that: The timing of gas turbine overhaul is determined by the speed difference of the high-pressure compressor before and after the full life map assessment test, or the rear air pressure difference of the high-pressure compressor before and after the full life map assessment test.

2. The method for determining the repair timing of a marine gas turbine according to compressor parameters as claimed in claim 1, characterized in that: The steps include: Step 1: Perform a full life map test on the gas turbine. Before the test, after the test and after the flow cleaning, the gas turbine is operated according to the expected operating conditions. Step 2: Correct the operating parameters obtained by running the gas turbine in step 1. The actual power obtained under each working condition before and after the test is recorded as W 试验前 , W 试验完成后 , W 试验前 , W 试验完成后 The atmospheric parameters and output shaft characteristics are corrected to obtain the power correction value before and after the test, recorded as W 试验前修正值 , W 试验完成后修正值 , The high pressure compressor speed at each operating condition before and after the test is recorded as N 2试验前 、N 2试验完成后 , N 2试验前 、N 2试验完成后 The atmospheric conditions, total intake pressure loss and exhaust static pressure loss are corrected to obtain the high-pressure compressor speed correction value before and after the test, which is recorded as N 2试验前修正值 、N 2试验完成后修 At the time, According to the relationship between the high pressure compressor speed correction value and the power correction value before and after the test, the rated operating power correction value is obtained, which is recorded as W 1.0工况修正值 , and the corresponding high pressure compressor speed correction value before and after the test, denoted as N 2试验前1.0工况修正值 、N 2试验完成后1.0工况修正值 , Step 3: The numerical difference between the high-pressure compressor speed correction value before and after the test in step 2 is used as the speed reference for repair.

3. The method for determining the repair timing of a marine gas turbine according to compressor parameters as claimed in claim 2, characterized in that: In step 2, the high pressure compressor speed correction formula is as follows: Where N 2实测值 To measure the high pressure compressor rotor speed, N 2修正值 The corrected speed is the speed corrected to the specified reference atmospheric conditions and intake and exhaust resistance loss deviation, T 实测值 To measure the atmospheric temperature, D′ i , D″ i They are intake resistance loss and exhaust resistance loss deviation correction coefficients respectively.

4. The method for determining the repair timing of a marine gas turbine according to compressor parameters as claimed in claim 2, characterized in that: In step 3, the numerical difference between the high pressure compressor speed correction value before and after the test is recorded as: ΔN2, ΔN2 = N 2试验完成后1.0工况修正值 -N 2试验前1.0工况修正值 .

5. The method for determining the repair timing of a marine gas turbine according to compressor parameters as claimed in claim 1, characterized in that: The steps include: Step 1: Perform a full life map test on the gas turbine. Before and after the test (after flow cleaning), the gas turbine is operated according to the expected operating conditions. Step 2: Correct the operating parameters obtained by running the gas turbine in step 1. The actual power obtained under each working condition before and after the test is recorded as W 试验前 , W 试验完成后 , W 试验前 , W 试验完成后 The atmospheric parameters and output shaft characteristics are corrected to obtain the power correction value before and after the test, recorded as W 试验前修正值 , W 试验完成后修正值 , The air pressure after the high pressure compressor of each working condition before and after the test is recorded as P 2试验前 , P 2试验完成后 , the atmospheric conditions, total intake pressure loss and exhaust static pressure loss are corrected to obtain the corrected value of the air pressure after the high-pressure compressor before and after the test, recorded as P 2试验前修正值 , P 2试验完成后修正值 , According to the relationship between the air pressure correction value after the high pressure compressor and the power correction value before and after the test, the rated operating power correction value is obtained, which is recorded as W 1.0工况修正值 , and the corresponding correction value of the air pressure after the high pressure compressor before and after the test, denoted as P 2试验前1.0工况修正值 , P 2试验完成后1.0工况 Correction value, Step 3: The difference between the corrected values ​​of the air pressure behind the high-pressure compressor before and after the test in step 2 is used as the reference of the air pressure behind the high-pressure compressor when the repair is in progress.

6. The method for determining the repair timing of a marine gas turbine according to compressor parameters as claimed in claim 5, characterized in that: In step 2, the correction formula for the air pressure correction value after the high-pressure compressor is as follows: Where P 2实测值 To measure the air pressure after the high pressure compressor, P 2修正值 The air pressure after the high pressure compressor is corrected to the specified reference atmospheric conditions and the intake and exhaust resistance losses. ∈1, ∈2 are intake resistance loss and exhaust resistance loss deviation correction coefficients respectively.

7. The method for determining the repair timing of a marine gas turbine according to compressor parameters as claimed in claim 5, characterized in that: In step 3, the difference between the corrected values ​​of the air pressure after the high-pressure compressor before and after the test is recorded as ΔP2, ΔP2 = P 2试验完成后1.0工况修正值 -P 2试验前1.0工况修正值 .

8. The method for determining the repair timing of a marine gas turbine according to compressor parameters as claimed in claim 2 or 5, characterized in that: In step 2, the power correction formula is as follows: Where W 实测值 is the measured power value, P 实测值 To measure the atmospheric pressure, T 实测值 To measure the atmospheric temperature, P0 is standard atmospheric pressure, T0 is the standard atmospheric temperature, θ1 and θ2 are the propeller characteristic correction coefficient and the power turbine relative speed correction coefficient respectively.

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