Method for evaluating the motoring characteristics of a marine gas turbine

Abstract

The application discloses a marine gas turbine maneuvering characteristic evaluation method, and relates to the technical field of marine gas turbines. The method starts from the starting of the marine gas turbine, and then the shortest no-load warm-up time is passed. Then, the working condition is quickly raised to the maximum propelling power to perform a cold-state maneuvering test to obtain a cold-state test time consumption At1. In the state that the no-load warm-up has been completely preheated, the working condition is quickly raised to the maximum propelling power, and then the working condition is quickly lowered from the maximum propelling power to the no-load state to perform a hot-state maneuvering test to obtain a hot-state test time consumption At2 and a hot-state test time consumption At3. Then, the maneuvering characteristic evaluation result of the marine gas turbine is obtained. The evaluation method can comprehensively and quantitatively and accurately evaluate the maneuvering characteristic of the marine gas turbine, and makes up for the vacancy in the industry.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine gas turbine, in particular to a marine gas turbine maneuverability evaluation method. BACKGROUND

[0002] Marine gas turbine is a kind of high-speed rotating power equipment, which is widely used in ship power and ship power generation. Compared with marine diesel engine or steam turbine unit, marine gas turbine has the advantages of saving engine room area, starting fast, etc. The maneuverability of marine gas turbine directly affects the safety and reliability of the ship in emergency, but there is no good way to evaluate the maneuverability of marine gas turbine at present. SUMMARY

[0003] The applicant proposes a marine gas turbine maneuverability evaluation method aiming at the above problems and technical needs, and the technical scheme of the present application is as follows:

[0004] A marine gas turbine maneuverability evaluation method, the marine gas turbine maneuverability test method comprises:

[0005] The cold-state maneuverability test of the marine gas turbine is carried out, and the cold-state test time of the marine gas turbine from the cold-state starting to reaching the highest propulsion power is determined △t1 ;

[0006] The hot-state maneuverability test of the marine gas turbine is carried out, and the hot-state test time of the marine gas turbine from the hot-state condition to reaching the highest propulsion power is determined △t2 , and the hot-state test time of the marine gas turbine from the highest propulsion power to the idle state is determined △t3 ;

[0007] The cold-state test time △t1 , the hot-state test time △t2 and the hot-state test time △t3 are obtained to evaluate the maneuverability of the marine gas turbine.

[0008] Further technical scheme is that during the cold-state maneuverability test and the hot-state maneuverability test of the marine gas turbine, when the high-pressure rotating speed of the marine gas turbine reaches the high-pressure rotating speed target value, it is determined that the marine gas turbine reaches the highest propulsion power, and the high-pressure rotating speed target value is related to the real-time temperature in the test process.

[0009] Further technical scheme is that the high-pressure rotating speed target value is , wherein, N 2_h is the historical high-pressure rotating speed value of the marine gas turbine reaching the highest propulsion power in the historical operation process, Th is the atmospheric temperature value when the marine gas turbine reaches the highest propulsive power in the historical operation process, T is the real-time temperature in the test process.

[0010] A further technical solution is to obtain the evaluation result of the maneuvering characteristics of the marine gas turbine, including:

[0011] When Δti ≤ ti max , it is determined that the marine gas turbine meets the cold-state maneuvering requirement;

[0012] When Δt2≤ t2 max , and Δt3≤ t3 max , it is determined that the marine gas turbine meets the hot-state maneuvering requirement;

[0013] When it is determined that the marine gas turbine meets the cold-state maneuvering requirement and the hot-state maneuvering requirement, an evaluation result of maneuvering characteristics is obtained to indicate that the maneuvering characteristics of the marine gas turbine meet the requirements, otherwise an evaluation result of maneuvering characteristics is obtained to indicate that the maneuvering characteristics of the marine gas turbine do not meet the requirements.

[0014] A further technical solution is to perform a cold-state maneuvering test on the marine gas turbine, including:

[0015] Starting the marine gas turbine in a cold state at t0 , controlling the marine gas turbine to run in an idle state according to the shortest warm-up time, and then controlling the marine gas turbine to continuously increase the load, and adjusting the water inlet valve of the water power dynamometer to meet the power absorption requirement of the load-increasing power turbine during the load-increasing process, until the high-pressure rotating speed of the marine gas turbine reaches the high-pressure rotating speed target value corresponding to the highest propulsive power at t1 N 2_p , it is determined that the cold-state test takes Δti = ti - to .

[0016] A further technical solution is to perform a hot-state maneuvering test on the marine gas turbine, including:

[0017] Controlling the marine gas turbine to start and stably run in an idle state to fully warm up;

[0018] Controlling the marine gas turbine to start continuously increasing the load at t2 , and adjusting the water inlet valve of the water power dynamometer to meet the power absorption requirement of the load-increasing power turbine during the load-increasing process, until the high-pressure rotating speed of the marine gas turbine reaches the high-pressure rotating speed target value corresponding to the highest propulsive power at t3 N 2_p , it is determined that the hot-state test takes​​Δt2= t3- t2 ;

[0019] When the marine gas turbine runs at the highest propulsion power for a predetermined length of time, the control of the marine gas turbine starts the continuous reduction of the working condition at t4 , and adjusts the water inlet valve of the hydraulic dynamometer to meet the power absorption requirement of the reduction working condition turbine during the reduction of the working condition, until the high-pressure rotating speed of the marine gas turbine reaches the high-pressure rotating speed corresponding to the no-load state at t5 , and determines the time consumption of the hot-state reduction test at N 2_l . Δt3= t5- t4 .

[0020] The beneficial technical effects of the present application are:

[0021] The present application discloses a marine gas turbine maneuverability evaluation method, which respectively carries out cold-state and hot-state maneuverability tests on the marine gas turbine, obtains the maneuverability evaluation result of the marine gas turbine through the cold-state test time consumption △t1 , the hot-state increase test time consumption △t2 and the hot-state reduction test time consumption △t3 , can comprehensively and quantitatively and accurately evaluate the maneuverability of the marine gas turbine, and make up for the industry vacancy.

[0022] In the test process of the maneuverability, the high-pressure rotating speed target value is determined through the high-pressure rotating speed vs. temperature and atmospheric pressure conversion algorithm, and the high-pressure rotating speed target value is used to determine whether the marine gas turbine reaches the highest propulsion power, and the evaluation accuracy is higher.

[0023] In the maneuverability test, the increase and reduction working condition buttons are continuously pressed until the set value of the high-pressure rotating speed reaches the high-pressure rotating speed target value, so that the deviation caused by the power absorption of the hydraulic dynamometer and the hysteresis of the measured power to the maneuverability test time is avoided, and the evaluation accuracy is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a method flowchart of the marine gas turbine maneuverability evaluation method of an embodiment of the present application.

[0025] Figure 2 is a test timing diagram in the cold-state maneuverability test of the marine gas turbine.

[0026] Figure 3 is a test timing diagram in the hot-state maneuverability test of the marine gas turbine. DETAILED DESCRIPTION

[0027] The specific embodiments of the present application will be further described below with reference to the accompanying drawings.

[0028] The present application discloses a marine gas turbine maneuverability evaluation method, please refer toFigure 1 The method shown in the flow chart includes the following steps:

[0029] 1. A cold state maneuverability test is performed on the marine gas turbine to determine the marine gas turbine from the cold state to reach the highest propulsive power W max The cold state test takes time △t1 . Wherein, when the high pressure speed N 2 of the marine gas turbine reaches the high pressure speed target value N 2_p , it is determined that the marine gas turbine reaches the highest propulsive power W max , the high pressure speed target value N 2_p is related to the real-time temperature T during the test process.

[0030] In one embodiment, the high pressure speed target value is , wherein, N 2_h is the historical high pressure speed value of the marine gas turbine when reaching the highest propulsive power W max during the historical operation process, T h is the atmospheric temperature value of the marine gas turbine when reaching the highest propulsive power W max during the historical operation process, unit K , so that the high pressure speed target value can be converted to temperature and atmospheric pressure.

[0031] In one embodiment, the cold state maneuverability test of the marine gas turbine includes the following process, please refer to the test timing diagram shown in Figure 2 : at t0 time, start the marine gas turbine in cold state, control the marine gas turbine to run under the condition of no load according to the shortest warm-up time, then control the marine gas turbine to continuously increase the working condition, and adjust the water inlet valve of the water power absorber during the increase of working condition to meet the power absorption requirement of the increase of working condition, until the high pressure speed of the marine gas turbine reaches the high pressure speed target value t1 N 2_p corresponding to the highest propulsive power at N 2_p time. In actual operation, press the increase of working condition button until the set value of the high pressure speed of the marine gas turbine is the high pressure speed target value N 2_l , then when the actual value of the high pressure speed of the marine gas turbine increases from the high pressure speed N 2_p ​The time at this moment is recorded as . t1 At any given moment, during the up-running condition, all systems and parameters of the marine gas turbine, including the low-pressure compressor anti-surge vent valve and anti-surge rotatable guide vanes, functioned normally. This allows the determination of the cold-state test duration. Δti = ti - to .

[0032] 2. Conduct hot-state maneuverability tests on marine gas turbines to determine the time required for the marine gas turbine to transition from its hot-state operating condition to its maximum propulsion power during the hot-state transition test. △t2 And determine the hot-state test time for marine gas turbines to transition from maximum propulsion power decompression condition to no-load condition. △t3 Similarly, when the high-pressure speed of a marine gas turbine... N 2. Achieve the target high-pressure speed value N 2_p At that time, determine when the marine gas turbine reaches its maximum propulsion power. W max High-pressure speed target value N 2_p With real-time temperature during the experiment T The related and one embodiment of the reduction algorithm is the same as that used in the cold maneuverability test.

[0033] In one embodiment, conducting a hot maneuverability test on a marine gas turbine includes the following procedures, please refer to [reference needed]. Figure 3 The test timing diagram shown: The marine gas turbine is started and run stably under no-load conditions to fully warm up, and then the marine gas turbine is controlled to... t2 The system continuously operates under elevated operating conditions, and during this period, the inlet valve of the hydraulic dynamometer is adjusted to meet the power absorption requirements of the power turbine under elevated operating conditions, until the high-pressure speed of the marine gas turbine reaches a certain level. t3 The target high-pressure speed value corresponding to the maximum propulsion power at all times N 2_p In actual operation, press the "Upgrade Operating Condition" button until the high-pressure speed of the marine gas turbine reaches the set value of the high-pressure speed target value. N 2_p Then, when the actual high-pressure speed of the marine gas turbine reaches the set value, the time at which this value is recorded is the [time value]. t3 At any given moment, during the hot-state test, all systems and parameters of the marine gas turbine, including the low-pressure compressor anti-surge vent valve and anti-surge rotatable guide vanes, functioned normally. This allows the determination of the hot-state test duration. △ t2= t3- t2 .

[0034] After the marine gas turbine has been running stably at its maximum propulsion power for a predetermined period of time, control the marine gas turbine to... t4the time when the high-pressure rotating speed of the marine gas turbine reaches the high-pressure rotating speed corresponding to the full-load state t5 the time when the high-pressure rotating speed of the marine gas turbine reaches the high-pressure rotating speed corresponding to the full-load state N 2_l In actual operation, the down-regulation button is pressed until the set value of the high-pressure rotating speed of the marine gas turbine is the high-pressure rotating speed corresponding to the idle state N 2_l Then, when the actual value of the high-pressure rotating speed of the marine gas turbine is the set value, the time when this occurs is recorded as the time t5 . During the down-regulation, the anti-surge bleed valve, anti-surge turning guide vanes and other systems and parameters of the low-pressure compressor of the marine gas turbine are all working normally. Then, the time consumption of the hot-state down-regulation test can be determined Δt3= t5- t4 .

[0035] 3. The evaluation result of the maneuvering performance of the marine gas turbine is obtained according to the time consumption of the cold-state test △t1 , the time consumption of the hot-state up-regulation test △t2 and the time consumption of the hot-state down-regulation test △t3 . The evaluation result includes: when Δti ≤ ti max , it is determined that the marine gas turbine meets the cold-state maneuvering requirement, when Δt2≤ t2 max and Δt3≤ t3 max , it is determined that the marine gas turbine meets the hot-state maneuvering requirement, and when it is determined that the marine gas turbine meets the cold-state maneuvering requirement and the hot-state maneuvering requirement, the maneuvering performance evaluation result indicating that the maneuvering performance of the marine gas turbine meets the requirement is obtained, otherwise, the maneuvering performance evaluation result indicating that the maneuvering performance of the marine gas turbine does not meet the requirement is obtained.

[0036] In one example, after the marine gas turbine has been stopped for 12 hours, the pre-starting work is completed and the marine gas turbine is started at the time t0 , and is operated for 6 minutes according to the shortest warm-up time in the idle state. After the 6-minute shortest warm-up time operation, the up-regulation button is pressed until the set value of the high-pressure rotating speed of the marine gas turbine reaches the high-pressure rotating speed corresponding to the highest propulsive power W max = 30 MW , and the time N 2_p = 8570 r / min is recorded as the time t1 .

[0037] In this example, the marine gas turbine reaches the highest propulsive power W max = 30MW the historical high pressure speed value N 2_h =8550r / min, the maximum propulsive power in the historical operation process W max the atmospheric temperature value at the time T h =300K, the real-time temperature in the test process T =305K, the equivalent calculated N 2_p =8570 r / min .

[0038] the final calculation Δti = ti - to = 670 s, while t1 max =690s, so the marine gas turbine can meet the cold state maneuvering requirements.

[0039] After the marine gas turbine has been started and stably operated for 20 minutes according to the operation procedures in the idle state, the up-condition button is pressed at the time t2 , and the test conditions are the same as those of the cold state test above, so the high pressure speed target value calculated is N 2_p =8570 r / min . Therefore, in this process, the set value of the high pressure speed of the marine gas turbine reaches the maximum propulsive power W max =30 MW , the corresponding high pressure speed target value N 2_p =8570 r / min , the high pressure speed at the time is recorded t3 , and the time Δt2= t3- t2 = 130 s is calculated.

[0040] After the marine gas turbine is stably operated at W max =30 MW , the down-condition button is pressed at the time t4 , and the time when the high pressure speed reaches the idle state corresponding to the high pressure speed of 4000 r / min is recorded t5 , and the time Δt3= t5- t4= 123s is calculated.

[0041] Since t2 max =135s , t3 max =130s , it can be determined that Δt2≤ t2 max and Δt3≤ t3max determining that the marine gas turbine satisfies the hot state maneuverability requirement.

[0042] In combination with the result of the marine gas turbine satisfying the cold state maneuverability requirement, a maneuverability evaluation result indicating that the maneuverability characteristic of the marine gas turbine satisfies the requirement can be obtained.

[0043] The above is only a preferred embodiment of the present application, and the present application is not limited to the above embodiments. It can be understood that other improvements and changes directly derived or thought of by those skilled in the art without departing from the spirit and concept of the present application should be considered to be within the scope of protection of the present application.

Claims

1. A method of evaluating the motoring characteristics of a marine gas turbine, characterized by, The marine gas turbine maneuverability test method comprises: A cold-state maneuverability test was conducted on the marine gas turbine to determine the cold-state test time from start-up to reaching maximum propulsion power. △t1 ; performing a hot state maneuverability test on the marine gas turbine to determine a hot state ramp-up test duration of the marine gas turbine from a hot state condition to reach a maximum propulsive power △t2 and to determine a hot state ramp-down test duration of the marine gas turbine from the maximum propulsive power to an idle condition △t3 ; from the cold test △t1 from the hot up test △t2 and from the hot down test △t3 to obtain a result of the evaluation of the maneuvering characteristics of the marine gas turbine. In the test process of the cold state maneuverability test and the hot state maneuverability test on the marine gas turbine, when the high-pressure rotating speed of the marine gas turbine reaches a high-pressure rotating speed target value, it is determined that the marine gas turbine reaches the highest propelling power, and the high-pressure rotating speed target value is related to the real-time temperature in the test process; The high-pressure rotation speed target value is wherein, N 2_h is a historical high-pressure rotation speed value of the marine gas turbine when reaching the highest propulsion power in a historical operation process, T h is an atmospheric temperature value of the marine gas turbine when reaching the highest propulsion power in the historical operation process, T is a real-time temperature in the test process. Wherein, the obtaining the maneuvering characteristic evaluation result of the marine gas turbine comprises: when △t1≤t1 max the marine gas turbine is determined to meet the cold-state maneuvering requirement; when △t2≤t2 max and △t3≤t3 max the marine gas turbine is determined to meet the hot-state maneuvering requirement; when the marine gas turbine is determined to meet the cold-state maneuvering requirement and the hot-state maneuvering requirement, obtaining the maneuvering characteristic evaluation result for indicating that the maneuvering characteristic of the marine gas turbine meets the requirement, otherwise obtaining the maneuvering characteristic evaluation result for indicating that the maneuvering characteristic of the marine gas turbine does not meet the requirement.

2. The marine gas turbine engine motoring characteristic evaluation method according to claim 1, characterized by, The cold state maneuverability test on the marine gas turbine comprises: At t0 the moment of starting the marine gas turbine in cold state, controlling the marine gas turbine to run in the shortest warm-up time after the no-load working condition, controlling the marine gas turbine to continue to increase the working condition, and adjusting the water inlet valve of the water power dynamometer during the working condition to meet the power absorption requirement of the working condition power turbine, until the high-pressure rotating speed of the marine gas turbine reaches the high-pressure rotating speed target value corresponding to the highest propelling power t1 at the moment N 2_p , determine the time-consuming of cold state test △t1= t1- t0 .

3. The marine gas turbine engine motoring characteristic evaluation method according to claim 1, characterized by, The hot state maneuverability test on the marine gas turbine comprises: controlling the marine gas turbine to start and stably operate under the no-load working condition to sufficiently warm up; controlling the marine gas turbine to start a step-up condition at t2 and adjusting the water inlet valve of the hydraulic dynamometer to meet the power absorption requirement of the step-up power turbine during the step-up condition until the high-pressure rotating speed of the marine gas turbine reaches the high-pressure rotating speed target value corresponding to the highest propelling power at t3 N 2_p determining the time consumption of the hot-state step-up test when △t2= t3- t2 ;​ after the marine gas turbine is operated at the maximum propulsive power for a predetermined length of time, controlling the marine gas turbine to start a continuous power-down condition at t4 and adjusting the water inlet valve of the hydraulic dynamometer during the power-down condition to meet the power absorption requirement of the power-down condition power turbine until the high-pressure rotating speed of the marine gas turbine reaches the high-pressure rotating speed corresponding to the no-load state at t5 N 2_l , and determining the time consumption of the hot-state power-down test △t3= t5- t4 .​

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