A safety fence for maintenance of low-pressure cylinders of steam turbines in nuclear power plants

Abstract

The invention discloses a safety fence for maintenance of a low pressure cylinder of a nuclear power plant turbine. The safety fence comprises a plurality of fence frames, a plurality of stand columnsand a plurality of sliding rails, and the fence frames, the stand columns and the sliding rails are made of stainless steel materials. When the safety fences are assembled around the low pressure cylinder, the multiple stand columns are arranged around the low pressure cylinder at intervals, the bottoms of the stand columns are detachably installed at a platform around the low pressure cylinder,each of the fence frames is detachably connected between every two adjacent stand columns, the sliding rails are detachably installed at the top ends of the stand columns, and every two adjacent sliding rails are detachably connected and fixed. The safety fence for the maintenance of the low pressure cylinder of the nuclear power plant turbine is attractive and neat in overall, handy and convenient to erect, and safe to use, the erection materials are not loose, and the safety fence for the maintenance of the low pressure cylinder of the nuclear power plant turbine is convenient for maintenance personnel to hang the safety belt.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant maintenance, in particular to a maintenance device for a low-pressure cylinder of a steam turbine in a nuclear power plant, and more specifically, to a safety fence for maintenance of a low-pressure cylinder of a steam turbine in a nuclear power plant. Background technique [0002] Since the beginning of the 21st century, with the gradual progress of nuclear power generation technology, the increasing tension in world energy, energy conservation and emission reduction and many other factors, nuclear power generation has been favored by various countries again, and a large number of nuclear power equipment has been put into use. Maintenance work is on the rise. [0003] As the core device of nuclear power plants, steam turbines are difficult to maintain due to their huge size and complex structure. Take the HN1000-6.43 single-shaft three-cylinder four-exhaust steam-condensing half-spee...

AI Technical Summary

Problems solved by technology

[0004] 1) In the process of opening and repairing the low-pressure cylinder of the steam turbine, a large amount of scaffolding needs to be erected, which requires a lot of manpower (about 10 people work continuously for more than 8 hours) and scaffolding materials, which is not conducive to the optimization of the maintenance period and cost control;

[0005] 2) Since the erection materials need to be erected using aluminum springboards, steel scaffolding pipes, fasteners, etc., and the distance from the horizontal plane where the low pressure cylinder is located to the titanium tube of the condenser reaches 15 meters, if the above erection materials accidentally fall, It is easy to damage the titanium tube of the condenser. If the titanium tube is damaged, it will undoubtedly increase the labor intensity of the maintenance personnel and the overhaul period (for example, the repair of the titanium tube will increase the construction period by about 3 days, and the replacement of the titanium tube will increase the construction period by 20 days). If the titanium tube is not treated, since the cooling water in the titanium tube of the condenser of the coastal nuclear power plant is seawater, the seawater is corrosive to the equipment, and the circulating cooling water enters the steam area of ​​the condenser and merges with the condensed water, which will lead to poor quality of condensed water. down, the unit is forced to reduce power until shutdown

[0006] 3) Scaffolding can only be erected on the periphery of the outer cylinder, and when the low-pressure rotor inside the inner cylinder is hoisted away, the maintenance work at the front and rear shaft seals of the low-pressure rotor and the low-pressure final stage becomes a side job (the drop reaches 15 meters above the ground), there are no safety measures, and the current side operations here only rely on the self-prevention awareness of the maintenance personnel

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