Precise and efficient adjustment process system for steam seal clearance of steam turbine

Abstract

The invention discloses a precise and efficient adjustment process system for a steam seal clearance of a steam turbine. Example verification of ten-odd domestic steam turbine generator units with different capacities proves that the working period for the link of steam seal clearance adjustment during unit maintenance can be controlled in seven days and is shortened by 5-10 days by comparison with a conventional adjustment method; the adjustment precision is well guaranteed and the economical performance of the whole units can be improved to a larger extent on the premise that safe and stable operation of the units is not affected. By means of the precise and efficient adjustment process system for the steam seal clearance, the maintenance period can be shortened, consumption of manpower and time is reduced, the heat consumption of the unit can be better reduced, the overall economical performance of the units is improved, the operation procedure is simple and convenient, and the system has high practical popularization and economical efficiency.

Description

technical field [0001] The invention relates to the field of precise adjustment of the steam seal gap of a steam turbine body, in particular to the field of radial gap adjustment of the shaft system flow part in the maintenance of a steam turbine generator set. Background technique [0002] The adjustment of the steam seal clearance is a very important and meticulous work in the maintenance of the steam turbine body, and it is also a key process that consumes manpower and man-hours and affects the progress of the maintenance schedule of the main line. The size of the seal gap is an important factor affecting the thermal efficiency of the steam turbine unit. According to relevant data, if the seal gap at the end of the high-pressure cylinder does not increase by 0.10mm, the steam leakage of the shaft seal will increase by 1~1.5t / h. For every increase of 0.10mm, the stage efficiency will decrease by 0.4~0.6%. In the past, there were two deficiencies in the traditional steam s...

AI Technical Summary

Problems solved by technology

The size of the seal gap is an important factor affecting the thermal efficiency of the steam turbine unit. According to relevant data, if the seal gap at the end of the high-pressure cylinder does not increase by 0.10mm, the steam leakage of the shaft seal will increase by 1~1.5t / h. For every increase of 0.10mm, the stage efficiency will decrease by 0.4~0.6%

In the past, there were two deficiencies in the traditional steam seal clearance adjustment work: first, the adjustment ideas and methods of each maintenance team were not the same, and there was no unified process arrangement and scientific and effective operating process standards for the steam seal clearance adjustment, which resulted in the time-consuming process of this link. Staying for about 12~17 days not only greatly affects the progress of the main line of the unit, but also puts a lot of pressure on the progress of other follow-up processes; secondly, we paid too much attention to the success of the first start-up and the safety of operation of the unit in the past maintenance , while ignoring the economy of the unit, starting from the idea of ​​seeking stability, the adjustment of the steam seal clearance is generally adjusted according to the upper limit of the manufacturer's design value, or even exceeds the upper limit of the design value, and there is no further adjustment to squeeze the steam seal clearance room

Images