Power station boiler membrane type water-cooled wall cleaning device

Abstract

The invention discloses a power station boiler membrane type water-cooled wall cleaning device. The power station boiler membrane type water-cooled wall cleaning device comprises a shell, wing devices are arranged on the two sides of the shell, a water spraying device is fixed at the top of the shell, a driving device is arranged at the bottom of the shell, a dust removing mechanism is movably connected to the output end of the driving device, and a camera shooting mechanism is fixed on the side, close to the dust removing mechanism, of the shell. According to the power station boiler membrane type water-cooled wall cleaning device, the effect that people do not need to enter a boiler to perform dust removing treatment on the membrane type water-cooled wall inside the boiler can be achieved, moreover, through the power station boiler membrane type water-cooled wall cleaning device, the membrane type water-cooled wall inside the boiler can undergo full-aspect dust removing treatment, the operation is relatively simple, and the certain efficiency is achieved.

Description

technical field [0001] The invention relates to the technical field of membrane water-cooled wall cleaning, in particular to a membrane-type water-cooled wall cleaning device for power plant boilers. Background technique [0002] From the perspective of boiler development history, the water-cooled wall of the drum boiler below the subcritical pressure is to protect the furnace wall, reduce its temperature, and improve the operational reliability of the boiler. Today, it has become the main evaporation heating surface of the boiler, and the water-cooled wall Placed on the inner wall of the furnace, close to the furnace wall and continuously lined up, basically in a vertical arrangement, generally composed of bare tubes or finned tubes, the main functions of the water wall are to protect the furnace wall, reduce coal slag and The high temperature of radiation has a destructive effect on the furnace wall. At present, the radiation heat transfer of the flame to the water wall ha...

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Problems solved by technology

[0003] However, there are certain safety problems in the existing membrane-type water-cooled walls of boilers. The thermal load of the boilers varies greatly. The thermal stress in the circumferential direction of the tube is uniform, the circumferential thickness of the tube is equal, the structure does not change, the structural stress is small, and its service life in normal operation can reach more than 20 to 30 years, while the membrane wall (finned tube) is a smooth tube. Composed of welded flat steel, after one side of the furnace is subjected to radiation heat exchange, the temperature along the circumference of the pipe is as follows: Figure 17 shown, from the attached Figure 17 It can be seen from the figure that after the membrane wall tube is radiated and heat-exchanged in the furnace, the temperature gradient along the circumference of the tube is very large, generally reaching about 2 times. If the upper inner wall is fouled, the temperature gradient of the membrane wall pipe will become larger. Under such working conditions, the circumferential thermal stress of the membrane wall pipe will become very large, especially near the header, and the structural mutation Stress, membrane wall tubes are very susceptible to fatigue failure due to alternating stress

[0004] At present, in the field of membrane-type water-cooled walls of power plant boilers, when designing membrane-type water-cooled walls, it is often designed that the staff can enter the inlet of the boiler, which is convenient for the staff to regularly clean the boiler membrane-type water-cooled walls, and It is also possible to weld some cracks, but in the process of dust removal or welding, due to the height of the membrane water wall itself, it is difficult to deal with the position of the top of the boiler. Therefore, we propose a power plant boiler membrane Type water wall cleaning device

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