CN-122014415-A - Method for adjusting lubricating oil bearing cavity of gas turbine and structure thereof

CN122014415ACN 122014415 ACN122014415 ACN 122014415ACN-122014415-A

Abstract

The application relates to a method for adjusting a lubricating oil bearing cavity of a gas turbine and a structure thereof. When the graphite sealing ring is worn out and failed during the operation of the gas turbine for a period of time, the bearing chamber is sealed with air outside the gas turbine body, and the gas turbine still needs to continue to operate, the gas turbine can be regulated by the regulating method provided by the application. If the oil consumption rate of the gas turbine is larger than the standard value, the bearing chamber can be positioned at a position with loose sealing by comparing the pressure of the bearing chamber and the oil return temperature. The device can be adjusted by adding a connecting pipeline of the bearing chamber and the static oil-gas separator and arranging an orifice plate at the added pipeline. The method has important significance for the stable operation of the gas turbine.

Inventors

WEI CHANGMIAO
LONG QIANG
ZHANG ZHIBO
QU LINWEI
HE BIN
CHEN LINJIE
YU YANGYANG

Assignees

中国船舶重工集团公司第七0三研究所无锡分部

Dates

Publication Date: 20260512
Application Date: 20260324

Claims (9)

1. A method for adjusting the lubricating oil bearing cavity of gas turbine features that it is suitable for the abrasion failure of graphite sealing ring and the abnormal increase of lubricating oil consumption rate, When the graphite sealing ring is worn and fails, the sealing air quantity is gradually reduced, so that the lubricating oil return temperature is gradually reduced under rated power; When the oil consumption rate is abnormally increased, the separator connecting branch pipe is additionally arranged, the pressure and the flow in the separator connecting branch pipe are regulated, and the pressure of the bearing chamber is reduced until the oil consumption rate is recovered to be normal.
2. The method of adjusting a lubricating oil bearing cavity of a gas turbine according to claim 1, wherein the sealing leakage position of the bearing cavity is positioned before the separator connecting branch pipe is added, and the pressure and the flow limit are adjusted at the sealing leakage position.
3. The method for adjusting the lubricating oil bearing cavity of the gas turbine according to claim 1, wherein the specific adjusting steps are as follows when the graphite sealing ring has abrasion failure: when the gas turbine operates for a period of time and has a graphite sealing ring abrasion fault, the oil return temperature of the bearing cavity is increased, so that the oil return temperature of the oil return is increased, the gas turbine is subjected to limiting protection, meanwhile, the sealing air of the bearing cavity is outside the gas turbine body, and the gas turbine still needs to continue to operate, and the gas turbine is regulated by the following method: and for the sealed air pipeline, the sealing pore plate is increased, the diameter of the sealing pore plate is gradually reduced, the sealing air quantity is reduced, and the oil return temperature of the bearing lubricating oil is reduced under rated power until the oil return temperature is lower than a limiting protection value, so that the bearing lubricating oil can continue to operate.
4. The method for adjusting a lubricating oil bearing cavity of a gas turbine according to claim 3, wherein the diameter of the seal orifice plate is gradually reduced a plurality of times, and each reduced variable is equal and a 1mm variable is adopted.
5. A method of adjusting a gas turbine oil bearing cavity as defined in claim 3 wherein the seal orifice plate is disposed within the seal air line.
6. The method for adjusting a lubricating oil bearing cavity of a gas turbine according to claim 1, wherein the specific adjusting step is as follows when the lubricating oil consumption rate of the gas turbine is greater than a standard value: if the pressure of a bearing chamber at a position is increased and the return oil temperature of the lubricating oil at the position is increased, the sealing leakage of the bearing chamber at the position is positioned, A way of separator connecting branch pipe is added at the sealing leakage position, and a throttle orifice plate is arranged at the separator connecting branch pipe so as to reduce the pressure of a bearing chamber; And gradually increasing the diameter of the throttle plate until the oil consumption rate is recovered to be normal, and reducing the oil return temperature of the bearing cavity under rated power and meeting the operation condition.
7. The method for adjusting a lubricating oil bearing cavity of a gas turbine according to claim 6, wherein the diameter of the sealing orifice plate is gradually increased a plurality of times, and each increased variable is equal, and a 1mm variable is adopted.
8. The method of adjusting a gas turbine oil bearing cavity according to claim 6, wherein the seal orifice plate is installed in series inside the separator connection manifold.
9. A gas turbine structure suitable for the adjustment method of the lubricating oil bearing cavity of the gas turbine is characterized by comprising a sealing air structure and a lubricating oil return structure, After positive pressure is formed in the sealed air cavity, part of positive pressure air in the sealed air cavity is discharged outwards through the comb teeth seal, and the other part of positive pressure air acts on the graphite sealing ring to form a gas seal barrier; The oil-gas mixture enters the static oil-gas separator through the separator connecting branch pipe to realize separation.

Description

Method for adjusting lubricating oil bearing cavity of gas turbine and structure thereof Technical Field The invention relates to the technical field of gas turbines, in particular to a method for adjusting a lubricating oil bearing cavity of a gas turbine and a structure thereof. Background The gas turbine is used as a power device rotating at high speed, and is accompanied with a high-frequency variable working condition when in work, when the rotor rotates at high speed and the rotor speed changes, a large amount of heat is generated between bearing bushes, and in order to take away hard inclusions formed between the joint surfaces in the bearing cavity and take away heat generated by friction and heat transferred to lubricating oil in a high-temperature area, the gas turbine needs a lubricating oil system for lubricating. However, when the gas turbine is operated for a period of time, especially near the service life of the overhaul, the graphite sealing ring of the lubricating oil bearing chamber is damaged, however, in specific situations, such as offshore oil platforms, the graphite ring still needs to be operated even in a worn state, and thus a lubricating oil bearing chamber adjusting method capable of ensuring the continuous operation of the unit is needed. Along with the running of the gas turbine, the consumption of lubricating oil exceeds a standard value along with the change of the sealing clearance of the comb teeth and the change of the sealing state of graphite, and in order to ensure the continuous and stable running of the unit, a lubricating oil bearing cavity adjusting method capable of ensuring the continuous running of the unit is also needed. Disclosure of Invention Aiming at the defects in the prior art, the application provides a method for adjusting a lubricating oil bearing cavity of a gas turbine and a structure thereof, which can rapidly relieve the working condition of high temperature and high pressure under the limit condition so that the gas turbine can continue to operate. The technical scheme adopted by the invention is as follows: An adjusting method of a lubricating oil bearing cavity of a gas turbine is suitable for the situation of abnormal increase of the lubricating oil consumption rate under the situation of abrasion failure of a graphite sealing ring, When the graphite sealing ring is worn and failed, the sealing air quantity is gradually reduced, so that the lubricating oil return temperature is gradually reduced under the rated power, When the oil consumption rate is abnormally increased, the separator connecting branch pipe is additionally arranged, the pressure and the flow in the separator connecting branch pipe are regulated, and the pressure of the bearing chamber is reduced until the oil consumption rate is recovered to be normal. As a further improvement of the above technical scheme: Before the separator connecting branch pipe is additionally arranged, the sealing leakage position of the bearing chamber is positioned, and the pressure and the flow limit are regulated at the sealing leakage position. When the graphite sealing ring is worn and failed, the specific adjusting steps are as follows: when the gas turbine operates for a period of time and has a graphite sealing ring abrasion fault, the oil return temperature of the bearing cavity is increased, so that the oil return temperature of the oil return is increased, the gas turbine is subjected to limiting protection, meanwhile, the sealing air of the bearing cavity is outside the gas turbine body, and the gas turbine still needs to continue to operate, and the gas turbine is regulated by the following method: and for the sealed air pipeline, the sealing pore plate is increased, the diameter of the sealing pore plate is gradually reduced, the sealing air quantity is reduced, and the oil return temperature of the bearing lubricating oil is reduced under rated power until the oil return temperature is lower than a limiting protection value, so that the bearing lubricating oil can continue to operate. The diameter of the sealing pore plate is gradually reduced for a plurality of times, the variable of each reduction is equal, and the variable of 1mm is adopted. The sealing orifice plate is arranged in the sealing air pipeline. When the lubricating oil consumption rate of the gas turbine is larger than the standard value, the specific regulation steps are as follows: if the pressure of a bearing chamber at a position is increased and the return oil temperature of the lubricating oil at the position is increased, the sealing leakage of the bearing chamber at the position is positioned, A separator connecting branch pipe is added at the sealing leakage position, and the separator connecting branch pipe is a connecting pipeline of a bearing chamber and a static oil-gas separator; And gradually increasing the diameter of the throttle plate until the oil consumption rate is recovered to be normal, and reducin