Absorption of Flue Gas
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Absorption of Flue Gas
Gases from incineration systems often contain considerable amounts of hydrogen chloride and elemental chlorine. To facilitate the treatment of these exhaust gases in downstream systems, they must be reliably cooled to temperatures close to the saturation point (60-90 ℃) either immediately following incineration or after heat recovery in a steam generator or a flue gas heat exchanger. In addition, recycling of the HCl gas as industrial-grade hydrochloric acid is desirable. Finally, any Cl2 present in the flue gases must also be removed. Systems made form graphite fully meet these requirements. On its way to the stack, the gas flows through a quencher, an HCl absorption column operated with fresh water, and finally an alkaline absorption unit for Cl2 removal, which is operated with water, NaOH and a reducing agent (e.g. Na2SO3). In the quencher, the top-fed gas causes evaporation of the circulating liquid. Gas and liquid flow together through the quenching pipes, which allows the gases to be quickly and reliably cooled to temperatures close to the saturation point. The circulating liquid can be cooled in a heat exchanger. This increases the HCl recovery rate if the temperature of the HCl solution is too high after the absorption stage.
Capacity and available sizes
The systems can be designed for a capacity of 60000 Nm³/h(flue gas). The equipment sizes are matched to the customer's needs.
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