Rapid repairing process for water wall of power station boiler

Abstract

The invention discloses a rapid repairing process for a water wall of a power station boiler. The process comprises the steps that an infrared imaging method is used to determine a leakage area of thetube panel of the water wall; the operation of the unit is stopped, and the boiler is stopped to release water, so as to lower the water wall temperature to below 100 DEG C; a hole is arranged in theleakage area of the tube panel, and an endoscope is used to precisely position an explosion leak position and a damaged position from the hole; the water wall with the explosion leak position and thedamaged position is cut and opened; if the damaged area is large, the water wall is cut, and then welding, tube replacing and repairing are carried out; one or two tube sections to be replaced are reserved; and the tube section is firstly bent and then welded and replaced, so that the welded joint of the part is located outside the water wall. According to the repairing process provided by the invention, the repairing period is shortened; the failure treatment time of the water wall is reduced; safe, long-term and stable operation of the repaired boiler is ensured; and the economic and social benefits are effectively improved.

Description

technical field [0001] The invention relates to the technical field of boiler overhaul, in particular to a rapid overhaul process for a water wall of a power station boiler. Background technique [0002] The water-cooled wall is the evaporation heating surface composed of many parallel tubes on the inner wall of the boiler furnace, and is the main heating part of the boiler. The function of the water-cooled wall is to absorb the radiant heat of the high-temperature flame or flue gas in the furnace, generate steam or hot water in the tube, and reduce the temperature of the furnace wall to protect the furnace wall. In large-capacity boilers, the flame temperature in the furnace is very high, and the intensity of heat radiation is very high. 40-50% or more of the heat in the boiler is absorbed by the water wall. [0003] During the operation of the boiler, the water wall is often corroded or scaled on the inner wall of the tube due to unqualified feed water and boiler water q...

AI Technical Summary

Problems solved by technology

With the increase of unit capacity, every outage of large-capacity thermal power generation units will cause great disturbance to the power grid system, and even destroy the stability of the power grid system, causing serious consequences such as large-scale power outages or power cuts. Great impact on the national economy and social life