Anti-abrasion device for high-temperature reheater

Abstract

The invention relates to an anti-abrasion device for a high-temperature reheater. The device is used for conducting anti-abrasion treatment on a metal pipe on the heated surface of the high-temperature reheater nearby a soot blower and comprises a hole-shaped pipe clamp, an anti-abrasion box and anti-abrasion covers which are arranged on the metal pipe of the heated surface of the high-temperature reheater. The metal pipe comprises a plurality of furnace pipes which are arranged side by side at equal intervals. Each furnace pipe comprises a U-shaped bent pipe section and a vertical pipe section arranged above the U-shaped bent pipe section. The anti-abrasion box covers the vertical pipe section close to one side of the soot blower. The anti-abrasion covers comprise the straight anti-abrasion cover and the 90-degree anti-abrasion cover, the straight anti-abrasion cover covers the furnace pipe on the innermost circle of the side, close to the soot blower, of the vertical pipe section, and the top of the straight anti-abrasion cover is welded to the bottom of the hole-shaped pipe clamp. The 90-degree anti-abrasion cover is arranged on the furnace pipe, close to the outermost circle of the soot blower, of the U-shaped bent pipe section in a covering mode, the top of the 90-degree anti-abrasion cover is welded to the bottom of the anti-abrasion box, and the anti-abrasion cover is fixed to the corresponding furnace pipe through an anti-abrasion cover butt strap. Compared with the prior art, the anti-abrasion device for the high-temperature reheater has the advantages of reducing the unit maintenance workloads, prolonging the service life of the metal pipe and the like.

Description

technical field [0001] The invention relates to the field of anti-wear of thermal power plant equipment, in particular to an anti-wear device for a high-temperature reheater. Background technique [0002] At present, the high-temperature reheaters of π-type boilers in thermal power plants are usually arranged in the horizontal flue at the furnace outlet, which is a suspended tube-panel structure. When the boiler is running, the heating surface of the high-temperature reheater will produce ash and coke, which will deteriorate the heat transfer. Therefore, a long telescopic rotary steam soot blower is installed near the heating surface to perform soot blowing on the heating surface to clean the heating surface. [0003] The sootblowing medium usually uses steam with a pressure of 1-1.5MPa and a temperature of 350°C. The effective sweeping radius of the sootblower is about 1.5-2 meters. At the same time, it also has adverse consequences of erosion and thinning of the metal pip...

AI Technical Summary

Problems solved by technology

However, due to the small distance between the tubes, it is impossible to install anti-wear tiles on each pipe in the pipe row. Therefore, the anti-wear tiles are generally only installed on the first pipe of the outer ring on the side of the blown soot steam, and because the anti-wear tiles cannot be completely The ring wraps the pipe, therefore, the anti-wear blind area is large, and the effect is not ideal

[0004] In addition, due to the unevenness of the tube panel (the panel-type heating surface arranged in the furnace), some tubes are out of the row, causing the tubes to be washed and worn, and one of the main reasons for the unevenness of the tube panel is: the tube panel of the original design Short service life under the action of high temperature flue gas

The pipe clamp is a plate structure, which has a small fit with the pipe, so the cooling effect obtained by the medium in the pipe is poor, and the middle section of the pipe clamp is relatively thin due to the thin wall thickness of the steel plate, so the plate-type pipe clamp is prone to bending and cracking after a period of operation , high temperature burnout and other failure conditions

[0005] To sum up, in view of the high-temperature reheater soot-blowing steam blowing damage, the anti-wear tiles and plate-type pipe clamps currently adopted have problems such as large anti-wear blind spots and tube screens coming out of the queue due to the failure of the pipe clamps, so they are blown out The range of the furnace tube is large and the thinning speed is fast. At the same time, because the wall thickness of the high-reflow tube is generally 4-5mm, it is easy to cause a tube explosion accident, which brings hidden dangers to the safe operation of the unit and increases the maintenance workload.

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