Process: welding
The water wall is the main heating part of the boiler, which is composed of several rows of steel tubes, distributed around the boiler furnace.
The function of water wall is to absorb the radiant heat of high-temperature flame or flue gas in the furnace, generate steam or hot water in the pipe, reduce the temperature of furnace wall, and 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 large. 40~50% or more of the heat in the boiler is absorbed by the water wall. With the exception of a few small capacity boilers, modern water tube boilers use water walls as the main evaporative heating surfaces.