Method for removing pollutants from a combustor flue gas and system for same
First Claim
1. A method for removing vapor phase air toxics from a combuster flue gas having fly ash particles therein comprising the steps of directing the flue gas through a particulate control device to remove fly ash particles from the flue gas, supplying sorbent to a baghouse having a filter bag therein until the filter bag is coated with a layer having a predetermined amount of sorbent and introducing the flue gas into the baghouse, the supplying step providing a high ratio of sorbent to vapor phase air toxics on the filter bag during the introducing step for facilitating intimate contact between the sorbent and the vapor phase air toxics on the filter bag and thus enhancing the sorbing of vapor phase air toxics from the flue gas.
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Abstract
A method for removing pollutants from a combustor flue gas. The method includes the steps of supplying sorbent to a baghouse having a filter bag therein until the filter bag is coated with a predetermined amount of sorbent and introducing the flue gas into the baghouse. Pollutants in the flue gas are sorbed by the sorbent on the filter bag. A system is provided for performing the method of the invention.
295 Citations
11 Claims
- 1. A method for removing vapor phase air toxics from a combuster flue gas having fly ash particles therein comprising the steps of directing the flue gas through a particulate control device to remove fly ash particles from the flue gas, supplying sorbent to a baghouse having a filter bag therein until the filter bag is coated with a layer having a predetermined amount of sorbent and introducing the flue gas into the baghouse, the supplying step providing a high ratio of sorbent to vapor phase air toxics on the filter bag during the introducing step for facilitating intimate contact between the sorbent and the vapor phase air toxics on the filter bag and thus enhancing the sorbing of vapor phase air toxics from the flue gas.
- 7. A method for cleansing a combuster flue gas having fly ash particles and mercury therein comprising the steps of directing the flue gas through a particulate control device to remove fly ash particles from the flue gas and produce a partially cleansed flue gas, discharging the removed fly ash particles from the particulate control device, supplying sorbent to a baghouse having a filter bag therein to provide a sorbent coated filter bag having an air-to-cloth ratio of at least 2 cm/sec and a pressure drop thereacross ranging from 0.75 to 3 kPa and introducing the partially cleansed flue gas into the baghouse to remove the mercury from the flue gas as the flue gas passes through the coating of sorbent on the filter bag, the supplying step providing a high ratio of sorbent to mercury on the filter bag during the introducing step whereby the removal of fly ash particles prior to the interaction of the flue gas with the sorbent facilitates disposal of the removed fly ash particles and reuse of the sorbent and the coating of the filter bag so that the filter bag has a high ratio of sorbent to mercury facilitates intimate contact between the sorbent and the mercury on the filter bag and thus enhances removal of the mercury from the flue gas during the introducing step.
Specification