CN117005956B

CN117005956B - Ignition starting oil supply method for gas turbine

Info

Publication number: CN117005956B
Application number: CN202210462727.6A
Authority: CN
Inventors: 巢益强; 王会社; 郭定坤
Original assignee: Institute of Engineering Thermophysics of CAS
Current assignee: Institute of Engineering Thermophysics of CAS
Priority date: 2022-04-27
Filing date: 2022-04-27
Publication date: 2025-10-31
Anticipated expiration: 2042-04-27
Also published as: CN117005956A

Abstract

This disclosure provides a fuel supply method for ignition and starting a gas turbine, including increasing the swashplate angle by a given inclination to bring the engine to ignition speed; activating the starting solenoid valve and ignition device, and starting a timer; after A seconds, controlling the fuel supply flow rate of the main fuel circuit to increase from a lean value to a rich value within N seconds; acquiring the exhaust temperature and calculating the increase in exhaust temperature within a specified time; when the increase in exhaust temperature is greater than or equal to a set value, the engine is determined to have successfully ignited; when the increase in exhaust temperature is less than the set value, the engine is determined to have failed to ignite. The fuel supply method for ignition and starting a gas turbine provided in this disclosure differs from conventional ignition and starting fuel supply methods with a fixed main fuel quantity within the ignition interval. In this method, the fuel quantity within the ignition interval changes gradually, i.e., from lean to rich, continuously adjusting the fuel-air ratio, which improves the reliability of successful engine ignition and reduces the possibility of engine detonation.

Description

Ignition starting oil supply method for gas turbine

Technical Field

The disclosure relates to the technical field of gas turbines, in particular to a gas turbine ignition starting oil supply method.

Background

The traditional oil supply control method is to drive a high-pressure fuel pump with fixed rotation speed and constant flow rate by using a power frequency motor, supply oil to an adjusting system, and adjust the flow rate of fuel oil supplied to a fuel engine by the adjusting system according to an instruction of a control system, wherein redundant fuel oil returns to the front of the pump or a fuel tank. However, the requirement on the oil-gas ratio in the ignition interval is higher, the ignition success rate of the ignition interval for the fuel engine according to the fixed fuel quantity is lower, and the phenomenon of ignition point failure often occurs in the ground ignition starting of a certain type of aeroderivative fuel engine. In addition, because the modified aeroderivative gas turbine is always not ignited according to the fixed fuel quantity, the oil accumulation in the combustion chamber is more, and the engine is difficult to blow clean during cold running, so that deflagration easily occurs once the engine is ignited.

Disclosure of Invention

The main purpose of the present disclosure is to provide a gas turbine ignition start oil supply method, which aims to solve the technical problems of low success rate of ignition start and easy occurrence of explosion of the gas turbine in the prior art.

To achieve the above object, the present disclosure provides a gas turbine ignition start oil supply method, including the steps of:

Step S10, increasing the angle of a sloping cam plate according to a given slope to bring the engine to the ignition speed, then switching on a starting electromagnetic valve and an ignition device, and starting timing;

Step S20, after A seconds, controlling the oil supply flow of the main oil way to increase from a lean oil value to a rich oil value in N seconds;

step S30, acquiring exhaust temperature, and calculating the increment of the exhaust temperature in a specified time;

Step S40, when the exhaust temperature increment is greater than or equal to a set value, judging that the ignition of the engine is successful;

and S50, judging that the ignition of the engine fails when the exhaust temperature increasing amount is smaller than a set value.

Optionally, the gas turbine ignition start oil supply method further comprises the following steps:

step S60, after the ignition of the engine is successful, continuously increasing the angle of the swash plate according to a given slope until 100%;

Step S70, controlling the oil supply flow of the main oil way to be reduced in a step mode, and then controlling the oil supply flow of the main oil way to be increased to a specified value in F seconds.

and S80, when the rotating speed of the engine is greater than or equal to the set rotating speed, reducing the angle of the swash plate to zero, and disconnecting the main pump motor of the hydraulic starting system.

step S90, acquiring the rotating speed of an engine, and judging whether the exhaust temperature is greater than or equal to a limit value when the rotating speed of the engine is not less than the closed-loop rotating speed in H seconds;

step 100, judging that the starting is overtime to stop when the engine rotating speed is smaller than the closed-loop rotating speed in H seconds;

and step S110, when the exhaust temperature exceeds a limit value, starting the over-temperature stopping.

Optionally, when the exhaust gas temperature increase amount is smaller than a set value, the step of determining that the engine fails to ignite includes:

step S501, disconnecting a starting oil circuit electromagnetic valve and an ignition device, closing a main oil circuit cut-off valve, and reducing the combustion opening to the minimum;

and S502, reducing the angular speed of the swash plate to zero, and switching off a main pump motor of the hydraulic starting system.

Optionally, the gas turbine ignition start oil supply method further includes:

Step S120, acquiring the rotation speed of an engine, and judging that the ignition and the starting of the engine fail when the rotation speed of the engine is smaller than the closed-loop rotation speed within H seconds;

step S130, disconnecting the starting electromagnetic valve and the ignition device, closing the main oil way cut-off valve, and reducing the combustion opening to the minimum;

and step 140, reducing the angular speed of the swash plate to zero, and switching off a main pump motor of the hydraulic starting system.

Optionally, after the step S20, the step of controlling the oil supply flow rate of the main oil passage to increase from the lean oil value to the rich oil value within N seconds further includes:

Step S201, switching on a starting electromagnetic valve and an ignition device;

step S202, after C seconds, the starting electromagnetic valve and the ignition device are disconnected.

The ignition starting oil supply method of the gas turbine comprises the steps of increasing a swash plate angle according to a given slope to bring an engine to an ignition rotating speed, switching on a starting electromagnetic valve and an ignition device, starting timing, controlling oil supply flow of a main oil way to increase from a lean oil value to a rich oil value within N seconds after A seconds, acquiring exhaust temperature, calculating the increase of the exhaust temperature within a set time, judging that the engine is successfully ignited when the increase of the exhaust temperature is greater than or equal to a set value, and judging that the engine is failed to ignite when the increase of the exhaust temperature is less than the set value. The ignition and starting oil supply method for the gas turbine is different from the conventional ignition and starting oil supply regular ignition interval fixed main fuel amount, the ignition interval fuel amount is in a small-to-large change process, namely, the fuel is lean to rich, the oil-gas ratio is continuously adjusted, the reliability of successful ignition of the engine is improved, and the possibility of deflagration of the engine is reduced. The method has simple system composition, improves the ignition reliability of the engine through the dynamic gas-oil ratio adjustment at the ignition moment, reduces the fuel quantity in a step-by-step manner after successful ignition, and reduces the possibility of deflagration of the engine.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained from the structures shown in these drawings without inventive effort to those of ordinary skill in the art.

FIG. 1 is a flow chart of an embodiment of a method for providing ignition start oil supply for a gas turbine in accordance with the present disclosure;

FIG. 2 is a flow chart of the gas turbine ignition start oil supply method provided in FIG. 1;

FIG. 3 is a flow chart of the method for providing ignition start oil supply for the gas turbine provided in FIG. 1.

The achievement of the objects, functional features and advantages of the present disclosure will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.

It should be noted that, if a directional indication is referred to in the embodiments of the present disclosure, the directional indication is merely used to explain a relative positional relationship between the components, a movement condition, and the like in a certain specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.

In addition, if there is a description of "first," "second," etc. in the embodiments of the present disclosure, the description of "first," "second," etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. Also, the technical solutions of the embodiments may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the combination of the technical solutions does not exist and is not within the scope of protection claimed in the present disclosure.

The gas turbine is an internal combustion power machine which takes continuously flowing gas as working medium to drive an impeller to rotate at high speed and convert the energy of fuel into useful work. The gas turbine, like most internal combustion engines, cannot be put into operation independently (self-starting), but rather needs to be assisted by external force (energy) to achieve a stable operating state (working condition) through a manually set starting process. Thus, the starting of a gas turbine is a complex system engineering in which the fuel supply is more important, which directly affects the reliability of the successful ignition of the engine.

In view of this, the present disclosure proposes an oil supply method that is different from the conventional ignition start oil supply regular ignition interval fixed main fuel amount.

Referring to fig. 1-3, in this embodiment, increasing the swash plate angle of the hydraulic starting system at a given slope turns the engine belt to the ignition speed, turns on the starting oil solenoid valve, turns on the ignition device, and turns off the starting oil solenoid valve and the ignition device after starting timing for a period of time, which is typically the maximum operating time allowed by the ignition device for a single time, and for which the maximum operating time allowed by the ignition device for the single time is 30s. The main oil way starts to supply oil after a certain time, and the oil supply amount is linearly increased from a lean oil value to a rich oil value within a fixed time period after the oil supply is started by taking a starting oil way and an ignition device as timing starting points. The lean oil value is 15% corresponding to the opening of the combustion regulating valve, the corresponding fuel quantity is about the main oil way, the rich oil value is 30% corresponding to the opening of the combustion regulating valve, and the corresponding fuel quantity is about 600kg/h. That is, with the start oil passage and the ignition turned on as the starting points of the timing, the main oil passage starts to supply oil after 10 seconds, and the amount of oil supply is controlled to linearly increase from the main oil passage to 600kg/h within 20 seconds.

From the above, the method for igniting, starting and supplying oil for the gas turbine provided by the present disclosure has the advantages that the fuel quantity in the ignition section is changed from small to large, that is, the fuel is continuously adjusted from lean to rich, so that the reliability of successful ignition of the engine is greatly improved.

It should be noted that the given slope is adjustable, and is generally between 0.5% and 1.5%, and in this embodiment, 1% is taken according to the acceleration condition of the engine test belt and the forward engine.

Whether the engine is ignited or not is judged by the increase of the exhaust temperature in a certain time, generally, the increase of the exhaust temperature in 20s is taken according to the increase of the exhaust temperature in the normal test starting process of the engine and the single longest working time of the ignition device, and the exhaust temperature is increased by 30 ℃ in the embodiment, so that the engine can be regulated according to the specific test conditions. That is, the exhaust gas temperature is obtained, and the amount of increase in the exhaust gas temperature within 20s is calculated, and when the amount of increase in the exhaust gas temperature is greater than or equal to 30 ℃, it is determined that the engine ignition is successful, and when the amount of increase in the exhaust gas temperature is less than 30 ℃, it is determined that the engine ignition is failed.

In addition, if the ignition of the fixed fuel quantity is frequently not in touch, more oil is accumulated in the combustion chamber, and the engine is difficult to blow clean in cold running, so that the phenomenon of knocking easily occurs after the ignition of the engine is caused.

Therefore, in order to solve the problem of the easy occurrence of knocking, in the present embodiment, the fuel amount is decreased in steps after the ignition is successful. According to the specific test conditions of the engine, the step-reduced fuel quantity is ensured not to cause flameout of the engine, meanwhile, the step-reduced fuel can be carried out after the engine is started for 50-100 ms, the reduced fuel quantity is not less than the minimum atomized fuel quantity of the engine nozzle, the fuel is not directly reduced by 150kg/h after the engine is started for a period of time.

In the embodiment, the oil supply amount is judged to be reduced by a fixed oil supply amount in a step manner on the current basis after the engine is started, meanwhile, the opening degree of a swash plate angle of the hydraulic starting system is continuously increased according to a given slope, the fixed oil supply amount is reduced by the step manner, and in the embodiment, the opening degree of a combustion regulating valve is reduced by 6% in a step manner, and the corresponding fuel amount is about 150kg/h.

Further, after ignition is successful in the method, the rotating speed of the hydraulic starting system is cut off to 3200r/min, the starting timeout time is 98s, and the exhaust temperature overtemperature temperature in the starting process is 650 ℃. In the ignition starting process, the ignition point is not on, the starting overtime and the starting overtemperature are all stopped in an emergency way, namely, the starting oil way electromagnetic valve, the ignition device, the hydraulic starting system, the main way cut-off valve and the combustion opening degree are disconnected to the minimum.

In summary, according to the method for igniting, starting and supplying oil for the gas turbine provided by the disclosure, hardware resources of a control system are not increased, and compared with the fixed fuel quantity of an ignition interval, the method for dynamically adjusting the oil-gas ratio of the ignition interval improves the reliability of successful ignition. In addition, the step after successful ignition reduces the amount of fuel, reducing the likelihood of engine knock.

While the foregoing embodiments have been described in some detail for purposes of clarity of understanding, it will be understood that the foregoing embodiments are merely illustrative of the invention and are not intended to limit the invention, and that any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure. Finally, it should be noted that the foregoing embodiments are merely illustrative of the technical solutions of the present disclosure, and not limiting thereof, and although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments or equivalents may be substituted for some of the technical features thereof, and these modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present disclosure in essence.

Claims

1. A method for providing oil for ignition start of a gas turbine, comprising the steps of:

Step S10, increasing the angle of a swash plate of a hydraulic starting system according to a given slope so as to bring the engine to an ignition speed, then switching on a starting oil circuit electromagnetic valve and an ignition device, and starting timing;

step S50, when the exhaust temperature increment is smaller than a set value, judging that the ignition of the engine fails;

the ignition and start oil supply method of the gas turbine further comprises the following steps:

2. The gas turbine ignition start oil supply method according to claim 1, characterized by further comprising the steps of:

3. The gas turbine ignition start oil supply method according to claim 2, characterized by further comprising the steps of:

step 100, judging that the engine is started to stop overtime when the engine speed is smaller than the closed-loop speed within a set time H seconds;

4. The method for fueling a gas turbine engine ignition start of claim 1 wherein step S50 is comprised of, when said exhaust gas temperature increase is less than a set point, after said step of determining that engine misfire:

And S502, reducing the angle of the swash plate to zero, and switching off a main pump motor of the hydraulic starting system.

5. The gas turbine ignition start oil supply method according to claim 2, characterized in that the gas turbine ignition start oil supply method further comprises:

Step S130, disconnecting the starting oil circuit electromagnetic valve and the ignition device, closing the main oil circuit cut-off valve, and reducing the combustion opening to the minimum;

And step 140, reducing the angle of the swash plate to zero, and switching off a main pump motor of the hydraulic starting system.

6. The method for supplying oil for ignition start of gas turbine engine according to claim 1, wherein step S20, after A seconds, further comprises, after the step of controlling the supply flow rate of the main oil passage to increase from the lean value to the rich value within N seconds:

And taking the on-starting oil way electromagnetic valve and the ignition device as timing starting points, and disconnecting the on-starting oil way electromagnetic valve and the ignition device after a period of time.