Turbine steam seal clearance adjustment method

Abstract

The invention relates to a turbine steam seal clearance adjustment method. The turbine steam seal clearance adjustment method which is simple in process, convenient to operate and capable of digitally, accurately and truly quantifying the steam seal clearance adjustment quantity is not available at present. The turbine steam seal clearance adjustment method is characterized in that by the adoption of the mode that lead wires are pressed in a circumferential uniform division manner, a clearance, at a horizontal junction surface position, of a lower half cylinder sleeve is measured through a feeler gauge; as for steam seal clearances of other portions, the lead wires of corresponding specifications are pasted to steam seal teeth, ends are fixed, a rotor is hoisted to a working position, the lead wires pasted to the steam seal teeth are each rolled to form a groove mark, and the rotor is hoisted out; the thickness of the remaining portion of the groove mark of each lead wire is measured through a steam seal clearance measuring scale, the thicknesses are actual values of the steam seal clearances, the actual values are compared with design values, and adjustment values of the steam seal clearances are worked out; and then the turbine steam seal clearances are adjusted according to the adjustment values. The turbine steam seal clearance adjustment method is simple in process, convenient to operate and capable of accurately and digitally quantifying the steam seal clearance adjustment quantity.

Description

Technical field [0001] The invention relates to a method for adjusting the gap of the steam seal of a steam turbine, which is suitable for the installation and maintenance of various types of steam turbine units of thermal power, gas and nuclear power, and is mainly used for fine adjustment of the radial gap of the steam seal of the steam turbine. Background technique [0002] The adjustment of the gap of the steam seal is a very important and meticulous work in the process of steam turbine installation and maintenance, which is very important to the safe and economic operation of the unit. If the seal gap is too small, the rotor is easy to wear. If the seal gap is too large, the leakage of steam will increase, reducing the internal efficiency of the steam turbine. At the same time, the high and medium pressure cylinder steam will leak from the shaft end and affect the quality of lubricating oil, and the low pressure cylinder shaft end will leak air to reduce the unit vacuum. [0...

AI Technical Summary

Problems solved by technology

Including personnel factors (enlarge the gap to ensure safety, incorrect adjustment operation), equipment factors (poor elasticity of the spring leaf, loose adjustment block, burrs on the back arc of the steam seal), process factors (too large or too small gaps cannot be measured, relying on experience Estimated, cannot be quantified), leading to unsuccessful adjustment of the seal clearance

[0004] There are also some relatively good steam turbine seal clearance adjustment methods. For example, in the Chinese patent whose publication date is October 12, 2011 and whose publication number is CN102213110A, a method for measuring and trimming the radial clearance of the steam turbine seal is disclosed. Methods Quantitatively measure the seal gap of the whole circle with the seal gap measuring ruler, and read out the actual gap value for purposeful and targeted repair and scraping. The seal gap measuring ruler includes a measuring rod and a A dial indicator and a measuring head located at the lower end of the measuring rod, a through hole is arranged in the measuring rod, a wire sleeve is arranged on the upper part of the through hole, a measuring needle is arranged in the wire sleeve, the top of the measuring needle is connected with the dial indicator, and the middle part of the measuring needle is covered Spring, the top of the spring is fixedly connected to the wire sleeve, the end of the spring is connected to the tension sleeve, and the tension sleeve is fixed on the measuring needle. The process of this method is relatively complicated

[0005] To sum up, at present, there is no simple process, convenient operation, digital quantification of the steam seal clearance adjustment, accurate and more realistic steam turbine seal clearance adjustment method

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