Measuring method of radial flow clearance of steam turbine unit in full cylinder state

Abstract

The method for measuring the radial flow clearance in the full cylinder state of the steam turbine unit includes the following steps: place identification pieces at the bottom of the inner arc surface of each steam seal ring of the steam turbine set, place the first support and protection piece, and place the rotor in place. ; Fasten the upper half of the diaphragm and the upper half of the steam seal body; raise the rotor to a predetermined size, take out the first support and protection piece, and make the rotor fall smoothly on the bearing bush; raise the rotor and place it under the journal After the first support and protection part, let the rotor fall on the first support protection part; lift the upper half of the outer cylinder, the upper half of the inner cylinder and the upper half of the partition cover in turn; lift the rotor, take out the identification part, and measure the indentation thickness to obtain The radial flow clearance value of the lower part of the full cylinder state; place the identification piece on the top of the rotor or the inner hole of the steam seal ring, put the rotor in place and fasten all the stator parts in the upper half, lift all the stator parts in the upper half and remove the identification piece And measure the indentation thickness to obtain the radial flow gap value at the top of the full cylinder state. It is more conducive to controlling the uniformity of the radial flow gap.

Description

technical field [0001] The invention relates to a radial flow gap measurement technology of a steam turbine set, in particular to a method for measuring a radial flow gap of a steam turbine set in a fully solid cylinder state. Background technique [0002] With the continuous improvement of the economic requirements of the steam turbine unit, the steam inlet parameters and power of the steam turbine unit continue to increase, and it is required that the radial flow gap should be effectively controlled according to the design requirements, so that the smaller the better under the premise of satisfying the expansion gap . The higher the steam inlet parameter, the smaller the radial flow gap, and the higher the uniformity requirements around the radial flow gap behind the unit cover cylinder, so as to avoid the vibration of the unit due to the uneven radial flow gap. [0003] For example, the high-pressure module of Dongfang’s 660,000 ultra-supercritical cylindrical cylinder u...

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Problems solved by technology

[0003] For example, the high-pressure module of Dongfang’s 660,000 ultra-supercritical cylindrical cylinder unit is small in size. In the state of fully solid cylinder with half of the partitions at all levels fastened, because the diameter of the inner hole of the partition is about 600mm, it is impossible to measure the center of the partitions at all levels. Data, the traditional radial flow gap measurement method cannot reflect the actual situation of the radial flow gap because it cannot compensate the difference between the opening and closing cylinders

Moreover, since the high-pressure steam inlet parameters of the unit are high (inlet steam pressure 25.4MPa, inlet steam temperature 600 degrees), and the radial flow gap is small and the tolerance is small, during construction, if the radial flow cannot be accurately and reliably obtained gap, it is bound to be difficult to ensure the uniformity of the radial flow gap, and it is easy to cause the steam flow excitation

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