CFB series energy saving boiler water wall that are made of tubes welded together with or without a strip of metal in between. These walls form the enclosure of the coal combustion chamber. Membrane water wall are also referred to as the evaporator section; they contain water mostly in liquid form which gradually evaporates as it rises in the steam boiler. welding heat exchanger industrial boiler membrane water wall are membrane walls that are made of tubes welded together with or without a strip of metal in between. These walls form the enclosure of the coal combustion chamber. Water wall tubes are also referred to as the evaporator section; they contain water mostly in liquid form which gradually evaporates as it rises in the boiler. This is the introduction of CFB series energy saving boiler water wall .