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SOx Removal in Fluidized Bed Boiler Plants

SOx Removal in Fluidized Bed Boiler Plants

SOx Removal in Fluidized Bed Boiler Plants

(OP)
Is it common to have SOx removal (scrubber) for the flue gas of a coal fired fluidized bed boiler?  How many plants have a FB boiler with scrubbers?

RE: SOx Removal in Fluidized Bed Boiler Plants

I always thought that the bed is dosed with limestone which then absorbed the sulphur.

athomas236

RE: SOx Removal in Fluidized Bed Boiler Plants

(OP)
That is why we are wondering if there are other FB plants that have the scrubber installed.  It seems unusual and unnecessary, however, we are working with a plant that has one and is having problems with corrosion and deposition downstream of the scrubber.

RE: SOx Removal in Fluidized Bed Boiler Plants

In the USA, a new CFB boiler will be required to have a dry scrubber installed.  That is determined by the EPA as Best Available Controllable Technology.

RE: SOx Removal in Fluidized Bed Boiler Plants

The fluid bed boiler normally uses limestone as the bed medial, and this will remove 85-03% of so2. However, there are many cases where the bed media is not limestone- it can be sand ( riverbed sand- round edges as opposed to millsand with sharp edges)or other inert media.

These inert media are used if you are burning garbage or other material that would form a eutectic slag if limetone were used. In those cases, a scrubber is used.

RE: SOx Removal in Fluidized Bed Boiler Plants

When we consider that the Ca/S ratio in the bed increases a lot if higher SOx efficiencies are required then a supplementary FGD might be the best economical solution despite the higher capital cost.

A downstream FGD system can operate with Ca/S ratio as low as 1.1. The furnace bed can operate with Ca/S ratio as high as 2.5 (for very high efficiencies and high S content).

This may be true for very high sulfur fuels as petcoke (up to 7% S)

I think Jacksonville CFB power plant was planned this way.

fvincent

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