Condensation scrubbing is a relatively recent development in wet scrubber technology. Most
conventional scrubbers rely on the mechanisms of impaction and diffusion to achieve contact between the PM and liquid droplets. In a condensation scrubber, the PM act as condensation nuclei for the formation of droplets. Generally, condensation scrubbing depends on first establishing saturation conditions in the gas stream. Once saturation is achieved, steam is injected into the gas stream. The steam creates a condition of supersaturation and leads to condensation of water on the fine PM in the gas stream. The large condensed droplets can be removed by several conventional devices. Typically, a high efficiency mist eliminator is also used.
A high-efficiency condensation "growth" PM scrubber has been developed that is suitable for
both new and retrofit installations, and is designed specifically to capture fine PM that escapes primary PM control devices. This type of scrubber utilizes a multistage process, including pretreatment and growth chambers, that provide an environment that encourages the fine PM to coagulate and form larger particles. A schematic diagram of this scrubber is provided in Figure
conventional scrubbers rely on the mechanisms of impaction and diffusion to achieve contact between the PM and liquid droplets. In a condensation scrubber, the PM act as condensation nuclei for the formation of droplets. Generally, condensation scrubbing depends on first establishing saturation conditions in the gas stream. Once saturation is achieved, steam is injected into the gas stream. The steam creates a condition of supersaturation and leads to condensation of water on the fine PM in the gas stream. The large condensed droplets can be removed by several conventional devices. Typically, a high efficiency mist eliminator is also used.
A high-efficiency condensation "growth" PM scrubber has been developed that is suitable for
both new and retrofit installations, and is designed specifically to capture fine PM that escapes primary PM control devices. This type of scrubber utilizes a multistage process, including pretreatment and growth chambers, that provide an environment that encourages the fine PM to coagulate and form larger particles. A schematic diagram of this scrubber is provided in Figure
Schematic diagram of condensation growth scrubbers
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