Exhaust gas purification device and co2 recovery system
AssigneeIHI Corporation
InventorToshiyuki Naito
Life of this patent
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Abstract
An exhaust gas purification device downstream of a wet desulfurizer for a combustor has a vessel body for intake of exhaust gas from the wet desulfurizer at a lower portion and discharge of the same at an upper end, an auxiliary desulfurizing portion with an injection nozzles for injection of an alkaline solution at a position above an inlet in the vessel body to purify the exhaust gas, bag filters above the injection nozzles to separate particles in the exhaust gas, backwashing nozzles for injection of compressed gas from above the bag filters for backwashing, a drain-receiving tank for reception of drain from the vessel body and a supply pump for supply of the drain in the drain-receiving tank as alkaline solution to the injection nozzles.
Claims18
An exhaust gas purification device for an air or oxyfuel combustor and arranged downstream of a wet desulfurizer for exhaust gas treatment comprising
- a vessel body with an inlet and an outlet at a lower portion and a top end thereof, respectively, exhaust gas from the wet desulfurizer being introduced into and discharged from the vessel body through the inlet and the outlet, respectively,
- an auxiliary desulfurizing portion having injection nozzles for injecting an alkaline solution at a position in the vessel body above the inlet to purify the exhaust gas,
- bag filters fixed through a mounting plate to the vessel body at a position in the vessel body above the injection nozzles for separating particles in the exhaust gas purified with the alkaline solution,
- backwashing nozzles arranged above the bag filters for injecting compressed gas to backwash the bag filters,
- a drain-receiving tank for receiving drain from the vessel body and
- a supply pump for supplying the drain in the drain-receiving tank as alkaline solution to the injection nozzles.
A CO2 recovery system providing a CO2 recovery apparatus downstream of a wet desulfurizer arranged for an oxyfuel combustor to conduct exhaust gas treatment and comprising at least compressors and aftercoolers for cooling exhaust gas compressed by the compressors to thereby discharge condensed drains, thereby liquefying CO2, the system comprising,
- between the wet desulfurizer and the compressors,
- an exhaust gas purification device comprising a vessel body with an inlet and an outlet at a lower portion and a top end thereof, respectively, exhaust gas discharged from the wet desulfurizer being introduced into and discharged from the vessel body through the inlet and the outlet, respectively,
- an auxiliary desulfurizing portion having injection nozzles for injecting an alkaline solution at a position in the vessel body above the inlet to purify the exhaust gas,
- bag filters fixed through a mounting plate to the vessel body at a position in the vessel body above the injection nozzles for separating particles in the exhaust gas purified with the alkaline solution,
- backwashing nozzles arranged above the bag filters for injecting compressed gas to backwash the bag filters,
- a drain-receiving tank for receiving drain from the vessel body and
- a supply pump for supplying the drain in the drain-receiving tank as at least part of the alkaline solution to the injection nozzles, and
- an alkaline solution addition device for supplying to the drain-receiving tank the alkaline solution obtained by adjusting pH of the drains from the aftercoolers.
Dependencies are inferred from the claim text.