Method for dismounting sealing opening of rotor vane of low-pressure coal press machine of power plant

Abstract

The invention discloses a method for dismounting a sealing opening of a rotor vane of a low-pressure coal press machine of a power plant. The method comprises the following steps: firstly, a plurality of holes arranged in a row are drilled on two safety press pieces by using a driller, a hole is drilled on a fir type leaf root, a pull opening is formed, a chisel is used for extending into the pull opening and abutting against one row of holes of the safety press pieces, the safety press pieces are turned up towards the external side, and one end of a middle clamping piece is exposed out; a hole of 4 millimeters is drilled on the middle point of one end of the middle clamping piece by using the driller, and an M5 screw hole is bored; a pull device is manufactured, one end of the pull device is provided with an M5 screw rod planished along both sides of an axis, and a middle section is a connecting rod; the flat screw rod of the pull device is screwed in the screw hole of the middle clamping piece and is not engaged with the safety press pieces at both sides; a pull sleeve of the pull device is pulled, the middle clamping piece is pulled out, and the two safety press pieces and the fir type leaf root are respectively dismounted. By using the method, the sealing opening of the rotor vane can be conveniently dismounted, the dismounting and maintenance efficiency of equipment is enhanced, the maintenance cost is reduced, the maintenance period is shortened, and the normal operation of a thermoelectric device of the power plant is ensured.

Description

technical field [0001] The invention relates to a dismantling method for a rotor blade seal, in particular to a dismantling method for a rotor blade seal of a low-pressure coal compressor in a power plant. Background technique [0002] The low-pressure coal compressor is the key equipment for the combined cycle thermoelectric unit of the power plant that burns low calorific value blast furnace gas and gas turbine. The outline of the key technological process is: the blast furnace gas is fed from the inlet temperature of 35 degrees Celsius and the inlet pressure of 0.1 MPa to the outlet temperature of 230 degrees Celsius and the outlet pressure of 0.59 MPa after being pressurized by the low-pressure coal press, and then supplied to the high-pressure coal press. The machine continues to be pressurized and sent to the gas turbine for use. The rotor speed of the low-pressure coal compressor is relatively high, and the gas will greatly corrode the rotor blades. After a period of...

AI Technical Summary

Problems solved by technology

Due to the special sealing structure, such as figure 2 and image 3 As shown, the seal is mainly composed of a fir tree-shaped leaf root 3 located on the outer ring, two insurance pressing pieces 2 located in the fir tree-shaped leaf root 3 and an intermediate clip 1 located between the two safety pressing pieces 2, The principle is that the axial position of the vertical tree-shaped blade root and the vertical tree-shaped structure on the rotor is fixed, and the lower part of the safety pressing piece is connected with the lower part of the vertical tree-shaped blade root, so that the axial position of the safety pressing piece is fixed, and then the The middle clip is placed between the two safety clips, so that the radial direction of the longitudinal tree leaf root and the insurance clip can be fixed, and finally the upper part of the insurance clip is turned down and covered on the middle clip, so that the axial position of the middle clip Fixed; the special sealing structure generally cannot be dismantled, so usually the rotor of the low-pressure coal press together with the rotor blades are completely removed from the whole machine, and sent to the manufacturer to repair the damaged parts after separate disassembly by special equipment; so It increases the workload of equipment disassembly, increases the transportation cost of maintenance parts, the equipment repair period is long, and the efficiency is low, which seriously affects the normal operation of the thermoelectric device of the power plant

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