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Waste Heat Boilers Downstream of Isasmelt / Ausmelt Process
In the bath-lance melting process for recovering copper, nickel, lead, zinc and tin, process gas with a temperature of 1,200 °C – 1,550 °C is fed directly into a waste heat boiler. By cooling the exhaust gases, sticky dust remaining from the molten phase, is kept at a safe temperature range below the temperatures at which it would begin to soften. Depending on the design of the whole plant, the process gas is cooled down to between 600 °C and 900 °C in a two-pass vertical boiler or down to approximately 350 °C in a three-pass vertical/horizontal boiler. The dust is partly separated in the waste heat boiler. Further dust separation takes place in a baghouse or an electrostatic precipitator. If saturated steam is not being used, the dust can be condensed in an air-cooled condenser which is installed above the steam drum.
When processing recycled material in the smelting furnace, vapor pressure and steam temperature may be set lower because the acid dew point is lower.
The adapter elements between the furnace and the waste heat boiler can also be designed with special pipe walls with an even and smooth surface, so that accretions can be removed more easily with the help of the special Oschatz hammer cleaning system.
The adapter elements between the furnace and the waste heat boiler can also be designed with special pipe walls with an even and smooth surface, so that accretions can be removed more easily with the help of the special Oschatz hammer cleaning system.
Another specialty of the Oschatz solutions for bath lance ovens is the evaporator design of the furnace roof cooling system.
This evaporator system, which is integrated in the boiler’s water/steam circuit, operates in the temperature range above the dew point and thus achieves a longer service life compared to conventional water cooling. In addition, the furnace roof can be replaced more easily and more quickly.
A pressure relief flap is located at the highest point of the vertical boiler, which limits process gas pressure fluctuations to a maximum value.